Title
Interstitial Brachytherapy With or Without External-Beam Radiation Therapy in Treating Patients With Prostate Cancer
A Phase III Study Comparing Combined External Beam Radiation and Transperineal Interstitial Permanent Brachytherapy With Brachytherapy Alone for Selected Patients With Intermediate Risk Prostatic Carcinoma
Phase
Phase 3Lead Sponsor
Radiation Therapy Oncology GroupStudy Type
InterventionalStatus
Completed Results PostedIndication/Condition
Prostate CancerIntervention/Treatment
palladium 125-iodine ...Study Participants
588RATIONALE: Radiation therapy uses high-energy x-rays and other sources to damage tumor cells. Interstitial brachytherapy uses radioactive material placed directly into or near a tumor to kill tumor cells. Combining interstitial brachytherapy with external-beam radiation therapy may kill more tumor cells. It is not yet known whether interstitial brachytherapy is more effective with or without external-beam radiation therapy in treating prostate cancer.
PURPOSE: Randomized phase III trial to compare the effectiveness of interstitial brachytherapy with or without external-beam radiation therapy in treating patients who have prostate cancer.
OBJECTIVES:
Compare the 5-year freedom from progression in patients with intermediate-risk prostate cancer treated with interstitial brachytherapy with or without external beam radiotherapy (EBRT).
Compare biochemical (i.e., prostate-specific antigen) failure, biochemical failure by the Phoenix definition, disease-specific survival, local progression, and distant metastases in patients treated with these regimens.
Compare morbidity and quality of life of patients treated with these regimens.
Determine the feasibility of collecting Medicare data in a large Radiation Therapy Oncology Group (RTOG) prostate cancer clinical trial for cost effectiveness and cost utility analysis of combined treatment with interstitial brachytherapy and EBRT.
Prospectively collect diagnostic biopsy samples from these patients for future biomarker analyses.
OUTLINE: This is a randomized, multicenter study. Patients are stratified according to disease stage (T1c vs T2a or T2b), Gleason score (≤ 6 vs 7), prostate-specific antigen (< 10 ng/mL vs 10-20 ng/mL), and prior neoadjuvant hormonal therapy (yes vs no). Patients are randomized to 1 of 2 treatment arms.
Arm I: Patients undergo external beam radiotherapy 5 days a week for 5 weeks. Within 2-4 weeks of radiotherapy, patients undergo interstitial brachytherapy with iodine I 125 or palladium Pd 103 seeds.
Arm II: Patients undergo interstitial brachytherapy only, as in arm I. Quality of life is assessed at baseline, at 4, 12, and 24 months, and then annually for 3 years.
After completion of study treatment, patients are followed at 3-5 weeks, at 4, 6, 9, and 12 months, every 6 months for 4 years, and then annually thereafter.
100 Gy Palladium-103 (P-102) or 110 Gy Iodine-125 (I-125) seeds within 2-4 weeks of completion of external beam radiotherapy.
125 Gy Palladium-103 (P-103) or 145 Gy Iodine-125 (I-125) seeds within 4 weeks of study entry.
Total dose of 45 Gy to the prostate and seminal vesicles as a daily dose of 1.8 Gy given 5 times per week. The prescribed dose is defined at the International Commission of Radiation Units and Measurements (ICRU) reference point. Both 3D-conformal radiation therapy (3DCRT) and intensity modulated radiation therapy (IMRT) are permitted.
External beam radiation therapy (EBRT) and transperineal interstitial permanent brachytherapy (100/110)
Transperineal interstitial permanent brachytherapy (125/145)
DISEASE CHARACTERISTICS: Histologically confirmed adenocarcinoma of the prostate T1c-T2b, N0, M0 Intermediate-risk disease, as defined by 1 of the following: Gleason score < 7 AND prostate-specific antigen (PSA) 10-20 ng/mL Gleason score 7 AND PSA < 10 ng/mL No evidence of distant metastases Prostate volume ≤ 60 cc by transrectal ultrasonography American Urological Association voiding symptom score no greater than 15 (alpha blockers allowed) PATIENT CHARACTERISTICS: Age 18 and over Performance status Zubrod 0-1 Life expectancy Not specified Hematopoietic Not specified Hepatic Not specified Renal Not specified Other Patients must use effective contraception No other malignancy within the past 5 years except basal cell or squamous cell skin cancer or carcinoma in situ at any other site No major medical or psychiatric illness that would preclude study therapy No hip prosthesis PRIOR CONCURRENT THERAPY: Biologic therapy Not specified Chemotherapy No prior chemotherapy Endocrine therapy Prior neoadjuvant hormonal therapy allowed provided the following are true: Therapy was initiated within 2-6 months of study enrollment Therapy was no more than 6 months in duration Use of 5-alpha reductase inhibitors (e.g., finasteride) is discontinued before registration No concurrent hormonal therapy Radiotherapy No prior pelvic radiotherapy Surgery No prior radical surgery for prostate cancer No prior transurethral resection of the prostate No prior cryosurgery Other No prior transurethral needle ablation of the prostate No prior transurethral microwave thermotherapy of the prostate
| Event Type | Organ System | Event Term | EBRT + Brachytherapy | Brachytherapy Only |
|---|
A Freedom from Progression (FFP) failure includes biochemical failure, local failure, distant failure, or death due to any cause. Patients who are failure free with less than 5 years of follow-up or who receive any secondary salvage therapy are censored. Freedom from Progression rates are estimated using the Kaplan-Meier method.
Biochemical failure is defined as having 3 consecutive rises of post-treatment PSA or starting hormones after one or more elevations in post-treatment PSA but before 3 consecutive elevations are documented. The sum of the 3 consecutive rises must exceed 1 ng/mL above the nadir. If 3 consecutive PSA rises occur during the first 24 months followed by a subsequent non-hormonal induced PSA decrease, patients will not be considered PSA failures. Three consecutive rises with any of the 3 PSA values occurring more than 24 months after the implant procedure will constitute a failure. Time to biochemical is defined as time from randomization to the date of first biochemical failure, last known follow-up (censored), or death without biochemical failure (competing risk). Biochemical failure rates are estimated using the cumulative incidence method. Five year rates are reported.
Biochemical Failure is defined as an increase of 2 ng/ml or more in PSA over the nadir PSA after 24 months from the start of treatment or the start of salvage hormones. Time to biochemical is defined as time from randomization to the date of first biochemical failure, last known follow-up (censored), or death without biochemical failure (competing risk). Biochemical failure rates are estimated using the cumulative incidence method. Five year rates are reported.
Prostate cancer death is defined as death due to prostate cancer or complications of treatment or death associated with any of the following: 1) further clinical tumor progression occurring after initiation of salvage androgen suppression therapy; 2) a rise that exceeds 1.0 ng/ml in the serum PSA level on at least two consecutive occasions that occurs during or after salvage androgen suppression therapy; and 3) disease progression in the absence of any anti-tumor therapy. Time to prostate cancer death is defined as time from randomization to the date of prostate cancer death, last known follow-up (censored), or death without prostate cancer (competing risk). Prostate cancer death rates are estimated using the cumulative incidence method. Five year rates are reported.
Failure is defined as progression (increase in palpable abnormality) at any time, failure of regression of the palpable tumor by two years, and redevelopment of a palpable abnormality after complete disappearance of previous abnormalities. Histologic criteria for local failure are presence of prostatic carcinoma upon biopsy and positive biopsy of the palpably normal prostate more than two years after the start of treatment. Time to local failure is defined as time from randomization to the date of first local failure, last known follow-up (censored), or death without local failure (competing risk). Local failure rates are estimated using the cumulative incidence method. Five year rates are reported.
Failure is defined as the appearance of any distant metastases. Time to distant metastases is defined as time from randomization to the date of first distant metastases, last known follow-up (censored), or death without distant metastases (competing risk). Distant metastases rates are estimated using the cumulative incidence method. Five year rates are reported.
Failure is defined as death due to any cause. Overall survival time is defined as time from randomization to the date of death or last known follow-up (censored). Survival rates are estimated using the Kaplan-Meier method. Five year rates are reported.
Acute toxicities are scored according to NCI Common Toxicity Criteria (CTC) version 2.0 and will be defined as the worst severity of the toxicity occurring ≤ 180 days from start of radiation. The CTC v 2.0 assigns Grades 1 through 5 with unique clinical descriptions of severity for each toxicity based on this general guideline: Grade 1 Mild, Grade 2 Moderate, Grade 3 Severe, Grade 4 Life-threatening or disabling, Grade 5 Death related to based.
Late toxicities are scored according to the Radiation Therapy Oncology Group (RTOG)/European Organisation for Research and Treatment of Cancer (EORTC) Late Radiation Morbidity Scoring Scheme and will be defined as the worst severity of the toxicity occurring > 180 days from radiation start. Grade 3+ GU/GI and overall were analyzed. RTOG/EORTC Late Radiation Morbidity Scoring Scheme assigns Grades 1 through 5 with unique clinical descriptions of severity for each toxicity based on this general guideline: Grade 1 Mild, Grade 2 Moderate, Grade 3 Severe, Grade 4 Life-threatening or disabling, Grade 5 Death related to toxicity. Time to late grade 3+ toxicity is defined as time from randomization to the date of first late grade 3+ toxicity, last known follow-up (censored), or death without late grade 3+ toxicity (competing risk). Late grade 3+ toxicity rates are estimated using the cumulative incidence method. Five year rates are reported.
The EPIC form is a 50-item, validated tool to assess disease-specific aspects of prostate cancer and its therapies and comprises of four summary domains (bowel, urinary, sexual, and hormonal function). The urinary domain summary score can be separated into 2 distinct subscales: urinary incontinence and urinary irritative. Hormonal domain was excluded as concurrent use of hormones was exclusionary and prior neoadjuvant hormone use was low. Response options for each EPIC item form a Likert scale and multi-item scale scores are transformed linearly to a 0-100 scale, with higher scores representing better health related quality of life. The change score was calculated as the value at 4 months minus the value at baseline. A negative change reflects a decline at 4 months and a positive change reflects an improvement at 4 months.
The EPIC form is a 50-item, validated tool to assess disease-specific aspects of prostate cancer and its therapies and comprises of four summary domains (bowel, urinary, sexual, and hormonal function). The urinary domain summary score can be separated into 2 distinct subscales: urinary incontinence and urinary irritative. Hormonal domain was excluded as concurrent use of hormones was exclusionary and prior neoadjuvant hormone use was low. Response options for each EPIC item form a Likert scale and multi-item scale scores are transformed linearly to a 0-100 scale, with higher scores representing better health related quality of life. The change score was calculated as the value at 24 months minus the value at baseline. A negative change reflects a decline at 24 months and a positive change reflects an improvement at 24 months.
The AUA-SI is a validated 7-item measure used to assess urinary symptoms. A higher score indicates more severe symptoms for the individual questions and overall total. Six questions ask about frequency of symptoms over the past month with possible responses: 0= Not at all; 1 = Less than 1 time in 5; 2 = less than half the time, 3 = About half the time, 4 = More than half the time, 5 = Almost always. An additional question asks the number of times one gets up to urinate after going to bed, with response indicating the exact number of times ranging from 0 to 5. The total score is the sum of the questions and ranges from 0 to 35. Change is calculated as follow-up timepoint score - baseline score such that a negative change reflects an improvement at the follow-up timepoint and a positive change reflects a decline at the follow-up timepoint.
The AUA-SI is a validated 7-item measure used to assess urinary symptoms. A higher score indicates more severe symptoms for the individual questions and overall total. Six questions ask about frequency of symptoms over the past month with possible responses: 0= Not at all; 1 = Less than 1 time in 5; 2 = less than half the time, 3 = About half the time, 4 = More than half the time, 5 = Almost always. An additional question asks the number of times one gets up to urinate after going to bed, with response indicating the exact number of times ranging from 0 to 5. The total score is the sum of the questions and ranges from 0 to 35. Change is calculated as follow-up timepoint score - baseline score such that a negative change reflects an improvement at the follow-up timepoint and a positive change reflects a decline at the follow-up timepoint.
The EQ-5D is a 2-part self-assessment questionnaire. First part is 5 items (mobility, self care, usual activities, pain/discomfort, anxiety/depression) each with 3 problem levels (1-none, 2-moderate, 3-extreme). The 5-item index score is transformed into a utility score between 0 (worst health state) and 1 (best health state). The 2nd part is a visual analogue scale (VAS) valuing current health state, measured on a 20-cm scale ranging from 0 for the worst imaginable health state to 100 for best imaginable health state, marked at 10-point intervals. The change score was calculated as the value at the follow-up timepoint minus the value at baseline. A negative change reflects a decline at the follow-up timepoint and a positive change reflects an improvement at the follow-up timepoint.
The EQ5D is a 2-part self-assessment questionnaire. First part is 5 items (mobility, self care, usual activities, pain/discomfort, anxiety/depression) each with 3 problem levels (1-none, 2-moderate, 3-extreme). The 5-item index score is transformed into a utility score between 0 (worst health state) and 1 (best health state). The 2nd part is a visual analogue scale (VAS) valuing current health state, measured on a 20-cm scale ranging from 0 for the worst imaginable health state to 100 for best imaginable health state, marked at 10-point intervals. The change score was calculated as the value at the follow-up timepoint minus the value at baseline. A negative change reflects a decline at the follow-up timepoint and a positive change reflects an improvement at the follow-up timepoint.
