Androgen Suppression Plus Radiation Therapy in Treating Patients With Prostate Cancer

Official Title: “Phase II Trial of Androgen Suppression for 6 Months Combined With External Beam Radiotherapy (EBRT) With Brachytherapy (BT) Boost for Intermediate Risk Prostate Cancer”

RATIONALE: Androgens can cause the growth of prostate cancer cells. Drugs, such as leuprolide, goserelin, flutamide, or bicalutamide, may stop the adrenal glands from making androgens. Radiation therapy uses high-energy x-rays to damage tumor cells. Giving these drugs together with radiation therapy may kill more tumor cells.

PURPOSE: This phase II trial is studying how well androgen suppression with either leuprolide or goserelin and either flutamide or bicalutamide together with radiation therapy works in treating patients with prostate cancer.

OBJECTIVES: - Determine the feasibility of androgen-suppression therapy combined with external-beam radiotherapy and boost brachytherapy (EBRT+BT) in patients with intermediate-risk localized prostate cancer. - Determine the safety of EBRT+BT in these patients. - Determine, in a preliminary manner, the efficacy of EBRT+BT in terms of rate of local recurrence at 5 years, time to prostate-specific antigen failure, and time to first rectal/bladder injury, in these patients.

OUTLINE: Patients receive either leuprolide intramuscularly or goserelin subcutaneously once every 12 weeks for a total of 24 weeks. Patients also receive either oral flutamide three times daily or oral bicalutamide once daily for 4 weeks.

Within 4 weeks after initiation of androgen-suppression therapy, patients undergo external-beam radiotherapy (EBRT) once daily, 5 days a week, for 5 weeks. At 2-4 weeks after completion of EBRT, patients undergo transrectal ultrasound-guided boost brachytherapy with implanted iodine I 125 or palladium Pd 103 seeds.

Patients are followed every 3 months for 2 years and then every 6 months for 4 years.

PROJECTED ACCRUAL: A total of 60 patients will be accrued for this study.

Intervention(s) in this Clinical Trial

• Drug: LHRH agonist
  • Lupron: 22.5mg IM injection q 12 wks x 2 OR Zoladex: 10.8 mg subQ injection q 12 wks x 2
• Drug: antiandrogen
  • flutamide 250 mg PO tid for 4 wks OR casodex 50 mg PO daily for 4 wks
• Radiation: radiation therapy
  • 4500 cGy total dose given days 1-5 for 5 weeks following initiation of androgen suppression (25 fractions)
• Radiation: Brachytherapy boost
  • Iodine 125 0.3 to 0.5 U per seed OR palladium 103 1.04 to 1.4 U per seed as implant; prescribed dose of I-125 100 Gy (TG-43) and Pd-103 90 Gy

Arms, Groups and Cohorts in this Clinical Trial

• Experimental: Androgen suppression + EBRT + Brachytherapy
  • Androgen suppression with external beam radiation therapy followed by brachytherapy boost

Primary Measures

• Toxicity
  • Time Frame: q 3 mon for 2 yrs post tx initiation
    Safety Issue?: Yes

Secondary Measures

• Time to PSA failure
  • Time Frame: 6 years
    Safety Issue?: No
• Survival
  • Time Frame: 6 years
    Safety Issue?: No

DISEASE CHARACTERISTICS:

• Histologically confirmed adenocarcinoma of the prostate
• Must have one of the following prognostic factors:
• Stage T1-2, N0; prostate-specific antigen (PSA) ≤ 10 ng/mL; and Gleason score > 6
• Stage T1-2, N0; PSA > 10 ng/mL and < 20 ng/mL; and Gleason score ≤ 6
• Stage T3a, N0; PSA ≤ 10 ng/mL; and Gleason score ≤ 6
• Prostate volume < 60 cc by transrectal ultrasound
• No distant or nodal metastases
• No metastatic disease by bone scan, CT scan, or MRI

PATIENT CHARACTERISTICS:

Age:

• 18 and over

Performance status:

• ECOG 0-2

Life expectancy:

• Not specified

Hematopoietic:

• Absolute neutrophil count ≥ 1,500/mm^3
• Platelet count ≥ 100,000/mm^3

Hepatic:

• Bilirubin ≤ 1.5 times upper limit of normal

Renal:

• Not specified

Other:

• Fertile patients must use effective contraception

PRIOR CONCURRENT THERAPY:

Biologic therapy:

• No prior immunotherapy for prostate cancer

Chemotherapy:

• No prior chemotherapy for prostate cancer

Endocrine therapy:

• Prior androgen-suppression therapy for up to 4 weeks duration allowed if initiated within 4 weeks of study radiotherapy
• No other prior hormonal therapy

Radiotherapy:

• No prior radiotherapy for prostate cancer

Surgery:

• No prior surgery for prostate cancer
• No prior transurethral resection of the prostate

Other:

• No prior alternative therapy (e.g., PC-SPES) for prostate cancer

Gender Eligibility for this Clinical Trial: Male

Minimum Age for this Clinical Trial: 18 Years

Maximum Age for this Clinical Trial: N/A

Are Healthy Volunteers Accepted for this Clinical Trial?: No

Lead Investigator: Cancer and Leukemia Group B Other

Overall Clinical Trial Officials and Contacts

Mark Hurwitz, MD Study Chair Dana-Farber/Brigham and Women's Cancer Center  

Information obtained from ClinicalTrials.gov on February 09, 2012

Link to the current ClinicalTrials.gov record. http://clinicaltrials.gov/show/NCT00006359

Study ID Number: CDR0000068228

ClinicalTrials.gov Identifier: NCT00006359

Health Authority: United States: Federal Government

Clinical trial summary from the National Cancer Institute's PDQ® database