Title

Light Dose Ranging Study of Photodynamic Therapy (PDT) With Levulan + Blue Light Versus Vehicle + Blue Light in Severe Facial Acne
A Randomized, Evaluator-blinded, Parallel Group Light Dose Ranging Study of Photodynamic Therapy With Levulan Topical Solution + Blue Light Versus Levulan Topical Solution Vehicle + Blue Light on Moderate to Severe Facial Acne Vulgaris
  • Phase

    Phase 2
  • Study Type

    Interventional
  • Study Participants

    266
The purpose of this study is to determine and compare the safety and efficacy of multiple broad area photodynamic therapy treatments with aminolevulinic acid (ALA-PDT) and vehicle (VEH-PDT) in subjects with moderate to severe facial acne vulgaris.
This is a Phase II multicenter, randomized, evaluator-blinded, vehicle-controlled, parallel group light dose ranging study of photodynamic therapy in subjects with moderate to severe facial acne vulgaris.

Subjects will be randomized to one of the following four treatment groups (1:1:1:1) to receive topical Levulan® Kerastick® containing 20% aminolevulinic acid HCL (ALA, active study drug) or the Kerastick® containing vehicle ingredients only (VEH).

Group 1 will have ALA applied to the entire facial area 45 minutes ± 15 minutes prior to BLUE light treatment for 1000 seconds (16 minutes 40 seconds)
Group 2 will have ALA applied to the entire facial area 45 minutes ± 15 minutes prior to BLUE light treatment for 500 seconds (8 minutes 20 seconds)
Group 3 will have VEH applied to the entire facial area 45 minutes ± 15 minutes prior to BLUE light treatment for 1000 seconds (16 minutes 40 seconds)
Group 4 will have VEH applied to the entire facial area 45 minutes ± 15 minutes prior to BLUE light treatment for 500 seconds (8 minutes 20 seconds)

Each subject may receive up to four treatments at three week (± 2 days) intervals. The power density (dose rate) and the total fluence (light dose) used at each treatment is intended to remain constant throughout each subject's participation. If a subject meets or exceeds the criteria restricting retreatment (CRR) prior to retreatment (Section 5.6), he/she will not receive additional PDT treatment at that visit and will be asked to return for the next scheduled PDT visit 3 weeks later, if applicable.

Post-treatment follow-up visits will be scheduled to occur at 3 and 6 weeks after the subject's final PDT.

Grading of the subject's facial acne will be conducted by a blinded evaluator who will remain blinded with respect to the subject's treatment assignment. Tolerability of treatment will be assessed by evaluations of the local skin response (erythema, edema, etc.) and will be conducted by an unblinded evaluator.

Safety will be evaluated by adverse events and local skin responses reported during the study.
Study Started
Mar 31
2007
Primary Completion
Jul 31
2008
Study Completion
Jul 31
2008
Results Posted
Aug 21
2009
Estimate
Last Update
Oct 24
2011
Estimate

Drug aminolevulinic acid HCL (ALA)

Levulan Kerastick containing 20% aminolevulinic acid HCL (ALA). Up to 4 treatments will be given at 3 week intervals.

  • Other names: Levulan, Levulan Kerastick

Other Vehicle (VEH)

Levulan Kerastick containing vehicle ingredients only (VEH). Up to 4 treatments will be given at 3 week intervals.

ALA 1000 seconds Active Comparator

Aminolevulinic acid HCL (ALA) applied to the entire facial area 45 minutes prior to BLUE light treatment for 1000 seconds (16 minutes and 40 seconds)

ALA 500 seconds Active Comparator

Aminolevulinic acid HCL (ALA) applied to the entire facial area 45 minutes prior to BLUE light treatment for 500 seconds (8 minutes and 20 seconds)

Vehicle 1000 seconds Placebo Comparator

Vehicle (VEH) applied to the entire facial area 45 minutes prior to BLUE light treatment for 1000 seconds (16 minutes and 40 seconds)

Vehicle 500 seconds Placebo Comparator

Vehicle (VEH) applied to the entire facial area 45 minutes prior to BLUE light treatment for 500 seconds (8 minutes 20 seconds)

Criteria

Inclusion Criteria:

Subject is male or non-pregnant female 12 years of age or older.
Females must be post-menopausal, surgically sterile or using a medically acceptable form of birth control, with a negative urine pregnancy test at the Baseline visit.
Subject has provided written and verbal informed consent. A subject under 18 years of age must be accompanied by the parent or legal guardian at the time of assent/consent signing. The parent or legal guardian must also provide informed consent for the subject.
Subject has moderate to severe facial acne vulgaris (including the nose), with at least 20 inflammatory lesions (papules, pustules, nodules).
Subject has moderate to severe acne as defined by an Investigator Global Assessment of 3 or 4 [0 (clear) to 4 (severe) scale].
Subject has a history of recurrent herpes simplex labialis infection in the treatment area AND has had an outbreak within the last 12 months must be placed on antiviral prophylaxis as specified in the protocol.
Subject is willing to comply with study instructions and return to the clinic for required visits.
Subject must have used the same type and brand of make-up, other facial products and hair products (e.g. shampoo, gel, hair spray, mousse, etc.) for at least 1 month prior to the Baseline Visit (General Skin & Hair Care). Upon enrollment, all subjects must a) use exclusively an Investigator approved facial cleanser and b) agree to continue their other General Skin & Hair Care for the entire study.

Exclusion Criteria:

Subject is pregnant, lactating, or is planning to become pregnant during the study.
Subject has a history of cutaneous photosensitization, porphyria, hypersensitivity to porphyrins or photodermatosis.
Subject has any skin pathology or condition that could interfere with the evaluation of the test product or requires the use of interfering topical or systemic therapy.
Subject has greater than 4 facial nodules (nodule = lesion greater than or equal 0.5 cm in diameter)
Subject has an uncorrected coagulation defect or concurrently uses anticoagulants (except aspirin).
Subject has any condition which, in the investigator's opinion, would make it unsafe for the subject to participate in this research study.
Subject is currently enrolled in an investigational drug or device study.
Subject has received an investigational drug or been treated with an investigational device within 30 days prior to the initiation of treatment (baseline).
Subject has facial hair that could interfere with the study assessments in the opinion of the investigator.
Subject is unable to communicate or cooperate with the investigator due to language problems, poor mental development, or impaired cerebral function.
Subject may be unreliable for the study including subjects who engage in excessive alcohol intake or drug abuse, or subjects who are unable to return for scheduled follow-up visits.
Subject has a known sensitivity to one or more of the vehicle components (ethyl alcohol, isopropyl alcohol, laureth 4, polyethylene glycol).
Subject has used photosensitizing drugs, e.g. declomycin, tetracycline, sulfa antibiotics, phenothiazines, etc. within a timeframe where photosensitization from these drugs may still be present.
Subject has used OTC acne medicated cleansers or soaps within 2 weeks of the initiation of treatment.
Subject has the need or plans to be exposed to artificial tanning devices or excessive sunlight during the trial.
Subject has used any of the following topical anti-acne preparations on the face: a.) Topical anti-acne treatments including benzoyl peroxide, antibiotics, azelaic acid, corticosteroids and salicylic acid within 2 weeks of the initiation of treatment b.) Retinoids, including tazarotene, adapalene, tretinoin within 4 weeks of the initiation of treatment. c.) Light treatments, microdermabrasion or chemical peels within 8 weeks of the initiation of treatment.
Subject has used any of the following systemic anti-acne medications: a.) Corticosteroids (including intramuscular and intralesional injections) within 4 weeks of the initiation of treatment. Inhaled corticosteroids are allowed if use is stable (stable use is defined as dose and frequency unchanged for at least 2 weeks prior to the initiation of treatment). b.) Antibiotics within 4 weeks of the initiation of treatment. c.) Nicotinamide containing products within 4 weeks of the initiation of treatment. d.) Spironolactone within 8 weeks of the initiation of treatment. d.) Retinoid therapy within 6 months of the initiation of treatment.

Summary

ALA 1000 Seconds

ALA 500 Seconds

Vehicle 1000 Seconds

Vehicle 500 Seconds

All Events

Event Type Organ System Event Term ALA 1000 Seconds ALA 500 Seconds Vehicle 1000 Seconds Vehicle 500 Seconds

Investigator Global Assessment of Acne Severity Successes

Scale consists of Grade 0 (clear skin) to Grade 4 (severe: up to many non-inflammatory and inflammatory lesions, but no more than a few nodular lesions) This assessment uses a dichotomized success/failure assessment - with success defined as a 2 point or more improvement on the IGA scale since baseline.

ALA 1000 Seconds

Failure

55.0
participants

Success

13.0
participants

ALA 500 Seconds

Failure

54.0
participants

Success

11.0
participants

Vehicle 1000 Seconds

Failure

52.0
participants

Success

15.0
participants

Vehicle 500 Seconds

Failure

55.0
participants

Success

11.0
participants

Change in Inflammatory Lesion Counts Relative to Baseline

ALA 1000 Seconds

-18.0
change in lesion count (Median)
Standard Deviation: 26.3

ALA 500 Seconds

-14.0
change in lesion count (Median)
Standard Deviation: 26.8

Vehicle 1000 Seconds

-19.0
change in lesion count (Median)
Standard Deviation: 22.8

Vehicle 500 Seconds

-14.5
change in lesion count (Median)
Standard Deviation: 24.0

Stinging/Burning at Visit 3 (Week 3 - During Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

46.0
participants

Grade 1 (minimal)

9.0
participants

Grade 2 (moderate)

7.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

33.0
participants

Grade 1 (minimal)

19.0
participants

Grade 2 (moderate)

8.0
participants

Grade 3 (severe)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

58.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Hyperpigmentation at Visit 5 (Week 6)

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

44.0
participants

Grade 1 (light)

13.0
participants

Grade 2 (moderate - small)

3.0
participants

Grade 3 (moderate - mod)

2.0
participants

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (light)

9.0
participants

Grade 2 (moderate - small)

3.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 1000 Seconds

Grade 0 (none)

46.0
participants

Grade 1 (light)

12.0
participants

Grade 2 (moderate - small)

2.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

8.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

2.0
participants

Grade 4 (marked)

Percent Change in Inflammatory Lesion Counts Relative to Baseline

ALA 1000 Seconds

-37.5
percent change in lesion count (Median)
Standard Deviation: 38.79

ALA 500 Seconds

-29.2
percent change in lesion count (Median)
Standard Deviation: 46.68

Vehicle 1000 Seconds

-41.7
percent change in lesion count (Median)
Standard Deviation: 38.82

Vehicle 500 Seconds

-37.0
percent change in lesion count (Median)
Standard Deviation: 40.23

Percent Change in Inflammatory Lesion Counts Relative to Baseline

ALA 1000 Seconds

-34.4
percent change in lesion count (Median)
Standard Deviation: 37.8

ALA 500 Seconds

-29.0
percent change in lesion count (Median)
Standard Deviation: 42.57

Vehicle 1000 Seconds

-48.4
percent change in lesion count (Median)
Standard Deviation: 32.81

Vehicle 500 Seconds

-45.2
percent change in lesion count (Median)
Standard Deviation: 50.15

Subject Satisfaction Score

Subject satisfaction score = Excellent (very satisfied) = Good (moderately satisfied) = Fair (slightly satisfied) = Poor (not satisfied at all)

ALA 1000 Seconds

Excellent

23.0
participants

Fair

17.0
participants

Good

18.0
participants

Poor

6.0
participants

ALA 500 Seconds

Excellent

11.0
participants

Fair

17.0
participants

Good

28.0
participants

Poor

5.0
participants

Vehicle 1000 Seconds

Excellent

23.0
participants

Fair

11.0
participants

Good

20.0
participants

Poor

4.0
participants

Vehicle 500 Seconds

Excellent

26.0
participants

Fair

12.0
participants

Good

23.0
participants

Poor

5.0
participants

Change in Inflammatory Lesion Counts Relative to Baseline

change in lesion counts compared to baseline

ALA 1000 Seconds

-18.5
change in lesion count (Median)
Standard Deviation: 30.15

ALA 500 Seconds

-13.0
change in lesion count (Median)
Standard Deviation: 28.74

Vehicle 1000 Seconds

-21.0
change in lesion count (Median)
Standard Deviation: 23.63

Vehicle 500 Seconds

-17.0
change in lesion count (Median)
Standard Deviation: 26.71

Investigator Global Assessment of Acne Severity Successes

Assessment uses a dichotomized success/failure assessment with success defined as a 2 point or more improvement since baseline. 0 Clear skin with no inflam or non-inflam lesions Almost clear; rare non-inflam lesions with no more than a few small inflam lesions Mild; > Grade 1; some non-inflam lesions with some inflam lesions (papules/pustules only; no nodules) Moderate; > Grade 2; up to many non-inflam lesions and a moderate number of inflam lesions but no more than one small nodule Severe; > Grade 3; up to many non-inflam and inflam lesions, but no more than a few nodules

ALA 1000 Seconds

Failure

53.0
participants

Success

15.0
participants

ALA 500 Seconds

Failure

54.0
participants

Success

11.0
participants

Vehicle 1000 Seconds

Failure

51.0
participants

Success

16.0
participants

Vehicle 500 Seconds

Failure

50.0
participants

Success

16.0
participants

Hyperpigmentation 48 Hours After PDT #1

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

14.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

1.0
participants

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

14.0
participants

Grade 2 (moderate - small)

1.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

7.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (light)

7.0
participants

Grade 2 (moderate - small)

3.0
participants

Grade 3 (moderate - mod)

3.0
participants

Grade 4 (marked)

Hyperpigmentation at Visit 3 (Week 3)

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

1.0
participants

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

2.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 1000 Seconds

Grade 0 (none)

48.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (light)

8.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

2.0
participants

Grade 4 (marked)

Stinging/Burning at Visit 3 (Week 3 - Post Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

9.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Hyperpigmentation at Visit 7 (Week 9)

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

49.0
participant

Grade 1 (light)

9.0
participant

Grade 2 (moderate - small)

4.0
participant

Grade 3 (moderate - mod)

1.0
participant

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

49.0
participant

Grade 1 (light)

11.0
participant

Grade 2 (moderate - small)

2.0
participant

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 1000 Seconds

Grade 0 (none)

45.0
participant

Grade 1 (light)

11.0
participant

Grade 2 (moderate - small)

1.0
participant

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

52.0
participant

Grade 1 (light)

10.0
participant

Grade 2 (moderate - small)

3.0
participant

Grade 3 (moderate - mod)

Grade 4 (marked)

Hyperpigmentation at Visit 9 (3 Weeks After Final PDT)

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

45.0
participants

Grade 1 (light)

12.0
participants

Grade 2 (moderate - small)

5.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

2.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 1000 Seconds

Grade 0 (none)

43.0
participants

Grade 1 (light)

11.0
participants

Grade 2 (moderate - small)

3.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (light)

7.0
participants

Grade 2 (moderate - small)

5.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Hyperpigmentation at Visit 10 (6 Weeks After Final PDT)

HYPERPIGMENTATION SCALE Grade 0 = No hyperpigmentation Grade 1 = Light hyperpigmentation involving small areas Grade 2 = Moderate hyperpigmentation involving small areas; light hyperpigmentation involving moderate areas Grade 3 = Moderate hyperpigmentation involving moderate sized areas; light hyperpigmentation involving large areas; small areas of marked hyperpigmentation Grade 4 = Marked hyperpigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

48.0
participants

Grade 1 (light)

12.0
participants

Grade 2 (moderate - small)

1.0
participants

Grade 3 (moderate - mod)

2.0
participants

Grade 4 (marked)

ALA 500 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (light)

9.0
participants

Grade 2 (moderate - small)

2.0
participants

Grade 3 (moderate - mod)

1.0
participants

Grade 4 (marked)

Vehicle 1000 Seconds

Grade 0 (none)

46.0
participants

Grade 1 (light)

7.0
participants

Grade 2 (moderate - small)

4.0
participants

Grade 3 (moderate - mod)

Grade 4 (marked)

Vehicle 500 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (light)

10.0
participants

Grade 2 (moderate - small)

3.0
participants

Grade 3 (moderate - mod)

1.0
participants

Grade 4 (marked)

Hypopigmentation 48 Hours Post PDT #1

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

67.0
participants

Grade 1 (light)

1.0
participants

Grade 2 (moderate - small)

ALA 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (light)

1.0
participants

Grade 2 (moderate - small)

Vehicle 1000 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

1.0
participants

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (light)

2.0
participants

Grade 2 (moderate - small)

Hypopigmentation at Visit 3 (Week 3)

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (light)

2.0
participants

Grade 2 (moderate - small)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (light)

1.0
participants

Grade 2 (moderate - small)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (light)

1.0
participants

Grade 2 (moderate - small)

Hypopigmentation at Visit 5 (Week 6)

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

Vehicle 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

ALA 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (light)

3.0
participants

Grade 2 (moderate - small)

ALA 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Hypopigmentation at Visit 7 (Week 9)

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (light)

2.0
participants

Grade 2 (moderate - small)

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Stinging/Burning at Visit 5 (Week 6 - Before Study Drug Application)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Hypopigmentation at Visit 9 (3 Weeks After Final PDT)

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

58.0
participants

Grade 1 (light)

4.0
participants

Grade 2 (moderate - small)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Hypopigmentation at Visit 10 (6 Weeks After Final PDT)

HYPOPIGMENTATION SCALE Grade 0 = No hypopigmentation Grade 1 = Light hypopigmentation involving small areas Grade 2 = Moderate hypopigmentation involving small areas; light hypopigmentation involving moderate areas Grade 3 = Moderate hypopigmentation involving moderate sized areas; light hypopigmentation involving large areas; small areas of marked hypopigmentation Grade 4 = Marked hypopigmentation involving moderate or large sized areas

ALA 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (light)

2.0
participants

Grade 2 (moderate - small)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (light)

Grade 2 (moderate - small)

Erythema at Baseline (Pre-light)

After solution application, prior to light treatment Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

29.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

13.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

31.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

13.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

35.0
participants

Grade 1 (minimal)

19.0
participants

Grade 2 (mild)

12.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

29.0
participants

Grade 1 (minimal)

25.0
participants

Grade 2 (mild)

12.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema at Baseline - Post Light Treatment

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

16.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

26.0
participants

Grade 3 (moderate)

3.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

18.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

16.0
participants

Grade 3 (moderate)

7.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

22.0
participants

Grade 1 (minimal)

19.0
participants

Grade 2 (mild)

22.0
participants

Grade 3 (moderate)

4.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

21.0
participants

Grade 1 (minimal)

27.0
participants

Grade 2 (mild)

15.0
participants

Grade 3 (moderate)

3.0
participants

Grade 4 (severe)

Erythema 48 Hours After PDT #1

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

19.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

14.0
participants

Grade 3 (moderate)

10.0
participants

Grade 4 (severe)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

16.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

23.0
participants

Grade 3 (moderate)

3.0
participants

Grade 4 (severe)

2.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

25.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

29.0
participants

Grade 1 (minimal)

30.0
participants

Grade 2 (mild)

7.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema at Visit 5 (Week 6 - Post Light Treatment)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

18.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (mild)

19.0
participants

Grade 3 (moderate)

4.0
participants

Grade 4 (severe)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

13.0
participants

Grade 1 (minimal)

18.0
participants

Grade 2 (mild)

24.0
participants

Grade 3 (moderate)

6.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

15.0
participants

Grade 1 (minimal)

28.0
participants

Grade 2 (mild)

15.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

19.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

17.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Erythema at Visit 3 (Week 3 - Pre Study Drug Application)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

36.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

8.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

35.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (mild)

11.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

5.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

9.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema at Visit 3 (Week 3 - Pre-light)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

27.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

11.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

30.0
participants

Grade 1 (minimal)

18.0
participants

Grade 2 (mild)

12.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

27.0
participants

Grade 1 (minimal)

27.0
participants

Grade 2 (mild)

7.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

32.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

12.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Erythema at Visit 3 (Week 3 - Post Light Treatment)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

13.0
participants

Grade 1 (minimal)

28.0
participants

Grade 2 (mild)

17.0
participants

Grade 3 (moderate)

4.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

16.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

18.0
participants

Grade 3 (moderate)

6.0
participants

Grade 4 (severe)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

18.0
participants

Grade 1 (minimal)

30.0
participants

Grade 2 (mild)

13.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

21.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

19.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Edema at Visit 5 (Week 6 - Post Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

55.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Erythema at Visit 5 (Week 6 - Prior to Study Drug Application)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

36.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

35.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

7.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

31.0
participants

Grade 1 (minimal)

22.0
participants

Grade 2 (mild)

7.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema at Visit 5 (Weeks 6 - Pre-light Treatment)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

27.0
participants

Grade 1 (minimal)

22.0
participants

Grade 2 (mild)

9.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

20.0
participants

Grade 1 (minimal)

28.0
participants

Grade 2 (mild)

12.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

22.0
participants

Grade 1 (minimal)

29.0
participants

Grade 2 (mild)

9.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

29.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

11.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Erythema at Visit 7 (Week 9 - Prior to Study Drug Application)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

37.0
participants

Grade 1 (minimal)

23.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

22.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

31.0
participants

Grade 1 (minimal)

22.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

36.0
participants

Grade 1 (minimal)

25.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema at Visit 7 (Week 9 - Pre Light Treatment)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

28.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (mild)

11.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

26.0
participants

Grade 1 (minimal)

24.0
participants

Grade 2 (mild)

8.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

28.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (mild)

11.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

33.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

7.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Erythema at Visit 7 (Week 9 - Post Light Treatment)

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

20.0
participant

Grade 1 (minimal)

13.0
participant

Grade 2 (mild)

22.0
participant

Grade 3 (moderate)

1.0
participant

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

14.0
participant

Grade 1 (minimal)

18.0
participant

Grade 2 (mild)

21.0
participant

Grade 3 (moderate)

7.0
participant

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

20.0
participant

Grade 1 (minimal)

19.0
participant

Grade 2 (mild)

15.0
participant

Grade 3 (moderate)

2.0
participant

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

18.0
participant

Grade 1 (minimal)

23.0
participant

Grade 2 (mild)

19.0
participant

Grade 3 (moderate)

2.0
participant

Grade 4 (severe)

Erythema 3 Weeks After Final PDT

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

ALA 1000 Seconds

Grade 0 (none)

36.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

5.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

35.0
participants

Grade 1 (minimal)

18.0
participants

Grade 2 (mild)

8.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

32.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

42.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (mild)

5.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Erythema 6 Weeks After Final PDT

Grade 0 = None Grade 1 = Minimal - barely perceptible erythema Grade 2 = Mild - predominantly minimal erythema (pink) in the treated area with or without a few isolated areas of more intense erythema Grade 3 = Moderate - predominantly moderate erythema (red) in the treated area with or without a few isolated areas of intense erythema (bright red) Grade 4 = Severe - predominantly intense erythema (bright red) in the treated area with or without a few isolated areas of very intense (fiery red) erythema

Vehicle 500 Seconds

Grade 0 (none)

43.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 1000 Seconds

Grade 0 (none)

39.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

33.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

9.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

30.0
participants

Grade 1 (minimal)

22.0
participants

Grade 2 (mild)

5.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Edema at Baseline - Pre Light Treatment

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema at Baseline - Post Light Treatment

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

5.0
participants

Grade 2 (mild)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema 48 Hours After PDT #1

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

4.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (mild)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

5.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Edema at Visit 3 (Week 3 - Before Study Drug Application)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

66.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Edema at Visit 3 (Week 3 - Before Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Edema at Visit 3 (Week 3 - Post Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema at Visit 5 (Week 6 - Before Study Drug Application)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema at Visit 5 (Week 6 - Pre Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema at Visit 7 (Week 9 - Before Study Drug Application)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Edema at Visit 7 (Week 9 - Prior to Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Edema at Visit 7 (Week 9 - Post Light Treatment)

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

55.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Edema 3 Weeks After Final PDT

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Edema 6 Weeks After Final PDT

EDEMA SCALE Grade 0 = None Grade 1 = Minimal - scant, rare edema Grade 2 = Mild - easily seen edema, minimally palpable, involving up to 1/3 of the treatment area Grade 3 = Moderate - easily seen edema and typically palpable, involving between 1/3 to 2/3 of the treatment area Grade 4 = Severe - easily seen edema, indurated in some areas, involving over 2/3 of the treatment area

ALA 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (mild)

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

Grade 2 (mild)

Stinging/Burning at Baseline - Before Light Treatment

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (moderate)

5.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (minimal)

11.0
participants

Grade 2 (moderate)

2.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

4.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Baseline - During Light

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

43.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (moderate)

4.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

33.0
participants

Grade 1 (minimal)

26.0
participants

Grade 2 (moderate)

6.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

2.0
participants

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

58.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Stinging/Burning at Baseline - Post Light Treatment

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 2 (minimal)

14.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

47.0
participants

Grade 2 (minimal)

17.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

63.0
participants

Grade 2 (minimal)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 2 (minimal)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Stinging/Burning 48 Hours Post PDT #1

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (minimal)

8.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

2.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Visit 5 (Week 6 - Prior to Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (moderate)

2.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Stinging/Burning at Visit 5 (Week 6 - During Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

41.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (moderate)

7.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

34.0
participants

Grade 1 (minimal)

16.0
participants

Grade 2 (moderate)

11.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Stinging/Burning at Visit 5 (Week 6 - Post Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

47.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

8.0
participants

Grade 2 (moderate)

4.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

Stinging/Burning at Visit 7 (Week 9 - Before Study Drug Application)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Visit 7 (Week 9 - Prior to Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

48.0
participants

Grade 1 (minimal)

8.0
participants

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

55.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Visit 7 (Week 9 - During Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

39.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

28.0
participants

Grade 1 (minimal)

21.0
participants

Grade 2 (moderate)

10.0
participants

Grade 3 (severe)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

54.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Visit 7 (Week 9 - Post Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

40.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (moderate)

6.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

54.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Stinging/Burning at Visit 9 (3 Weeks After Final PDT)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

1.0
participants

Stinging/Burning at Visit 10 (6 Weeks After Final PDT)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

57.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Scaling and Dryness 48 Hours After PDT #1

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

38.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

4.0
participants

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

35.0
participants

Grade 1 (minimal)

20.0
participants

Grade 2 (mild)

6.0
participants

Grade 3 (moderate)

3.0
participants

Grade 4 (severe)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

47.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

1.0
participants

Vehicle 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Scaling and Dryness at Visit 3 (Week 3)

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (minimal)

11.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

48.0
participants

Grade 1 (minimal)

11.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

44.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

55.0
participants

Grade 1 (minimal)

8.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Scaling and Dryness at Visit 5 (Week 6)

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (minimal)

13.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

40.0
participants

Grade 1 (minimal)

14.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (minimal)

9.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Scaling and Dryness at Visit 7 (Week 9)

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

44.0
participants

Grade 1 (minimal)

17.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

50.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

41.0
participants

Grade 1 (minimal)

11.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

2.0
participants

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

5.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Scaling and Dryness at Visit 9 (3 Weeks After Final PDT)

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

52.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

44.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (mild)

3.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (minimal)

11.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Scaling and Dryness at Visit 10 (6 Weeks After Final PDT)

SCALING AND DRYNESS SCALE Grade 0 = None Grade 1 = Minimal - barely perceptible desquamation Grade 2 = Mild - limited areas of fine desquamation in up to 1/3 of the treatment area Grade 3 = Moderate - fine desquamation involving 1/3 to 2/3 of the treatment area or limited areas of coarser scaling Grade 4 = Severe - coarser scaling involving more than 2/3 of the treatment area or limited areas of very coarse scaling

ALA 1000 Seconds

Grade 0 (none)

46.0
participants

Grade 1 (minimal)

15.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

Grade 4 (severe)

ALA 500 Seconds

Grade 0 (none)

45.0
participants

Grade 1 (minimal)

15.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

1.0
participants

Grade 4 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

43.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (mild)

4.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Vehicle 500 Seconds

Grade 0 (none)

56.0
participants

Grade 1 (minimal)

7.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Grade 4 (severe)

Oozing/Vesiculation/Crusting 48 Hours After PDT #1

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

ALA 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

1.0
participants

ALA 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (mild)

2.0
participants

Grade 3 (moderate)

1.0
participants

Vehicle 1000 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

4.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Oozing/Vesiculation/Crusting at Visit 3 (Week 3)

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

ALA 1000 Seconds

Grade 0 (none)

58.0
participants

Grade 1 (minimal)

5.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

ALA 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

65.0
participants

Grade 1 (minimal)

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Oozing/Vesiculation/Crusting at Visit 5 (Week 6)

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

Vehicle 500 Seconds

Grade 0 (none)

61.0
participant

Grade 1 (minimal)

2.0
participant

Grade 2 (mild)

Grade 3 (moderate)

ALA 1000 Seconds

Grade 0 (none)

59.0
participant

Grade 1 (minimal)

3.0
participant

Grade 2 (mild)

Grade 3 (moderate)

ALA 500 Seconds

Grade 0 (none)

57.0
participant

Grade 1 (minimal)

6.0
participant

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

56.0
participant

Grade 1 (minimal)

3.0
participant

Grade 2 (mild)

1.0
participant

Grade 3 (moderate)

Oozing/Vesiculation/Crusting at Visit 7 (Week 9)

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Grade 3 (moderate)

ALA 500 Seconds

Grade 0 (none)

58.0
participants

Grade 1 (minimal)

4.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

1.0
participants

Grade 3 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

63.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Oozing/Vesiculation/Crusting at Visit 9 (3 Weeks After Final PDT)

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

ALA 1000 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

Grade 3 (moderate)

ALA 500 Seconds

Grade 0 (none)

59.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

51.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

3.0
participants

Grade 2 (mild)

Grade 3 (moderate)

Stinging/Burning at Visit 3 (Week 3 - Before Study Drug Application)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

1.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

1.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

60.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

64.0
participants

Grade 1 (minimal)

2.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Oozing/Vesiculation/Crusting at Visit 10 (6 Weeks After Final PDT)

OOZING/VESICULATION/CRUSTING Grade 0 = None Grade 1 = Minimal - a single area of oozing, vesiculation or crusting 3 mm diameter or less in size Grade 2 = Mild - two to four areas of oozing, vesiculation or crusting 3 mm diameter or less in size OR a single area larger than 3 mm diameter in size Grade 3 = Moderate - more than a single area of oozing, vesiculation or crusting larger than 3 mm diameter in size or more than four areas of 3 mm diameter or less in size Grade 4 = Severe - any degree of oozing, vesiculation or crusting greater than (3) above

ALA 1000 Seconds

Grade 0 (none)

60.0
particpants

Grade 1 (minimal)

3.0
particpants

Grade 2 (mild)

Grade 3 (moderate)

ALA 500 Seconds

Grade 0 (none)

60.0
particpants

Grade 1 (minimal)

2.0
particpants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 1000 Seconds

Grade 0 (none)

55.0
particpants

Grade 1 (minimal)

2.0
particpants

Grade 2 (mild)

Grade 3 (moderate)

Vehicle 500 Seconds

Grade 0 (none)

63.0
particpants

Grade 1 (minimal)

1.0
particpants

Grade 2 (mild)

Grade 3 (moderate)

Stinging/Burning at Visit 3 (Week 3 - Before Light Treatment)

STINGING AND BURNING SCALE Grade 0 = None Grade 1 = Minimal, barely perceptible -tolerable and little discomfort Grade 2 = Moderate - tolerable, but causes some discomfort Grade 3 = Severe - very uncomfortable or intolerable

ALA 1000 Seconds

Grade 0 (none)

53.0
participants

Grade 1 (minimal)

6.0
participants

Grade 2 (moderate)

3.0
participants

Grade 3 (severe)

ALA 500 Seconds

Grade 0 (none)

49.0
participants

Grade 1 (minimal)

10.0
participants

Grade 2 (moderate)

2.0
participants

Grade 3 (severe)

Vehicle 1000 Seconds

Grade 0 (none)

62.0
participants

Grade 1 (minimal)

Grade 2 (moderate)

Grade 3 (severe)

Vehicle 500 Seconds

Grade 0 (none)

61.0
participants

Grade 1 (minimal)

4.0
participants

Grade 2 (moderate)

Grade 3 (severe)

Total

266
Participants

Age Continuous

20.1
years (Mean)
Standard Deviation: 6.3

Number of Inflammatory Lesions

44.5
lesions (Median)
Standard Deviation: 31.4

Age, Categorical

Edema

Erythema

Ethnicity (NIH/OMB)

Fitzpatrick Skin Type

Hyperpigmentation

Hypopigmentation

Investigator Global Assessment of Acne Severity

Oozing/vesiculation.crusting

Scaling and Dryness

Sex: Female, Male

Stinging/Burning

Overall Study

ALA 1000 Seconds

ALA 500 Seconds

Vehicle 1000 Seconds

Vehicle 500 Seconds

Drop/Withdrawal Reasons

ALA 1000 Seconds

ALA 500 Seconds

Vehicle 1000 Seconds

Vehicle 500 Seconds