Last updated on April 2017

A Phase II Neoadjuvant Study of ARN-509 Abiraterone Acetate Prednisone Degarelix and Indomethacin in Men With Localized Prostate Cancer Pre-prostatectomy


Brief description of study

This phase II trial studies how well androgen receptor antagonist ARN-509, abiraterone acetate, prednisone, degarelix, and indomethacin work in treating patients with prostate cancer that has spread from where it started to nearby tissue or lymph nodes before surgery. Androgen can cause the growth of tumor cells. Hormone therapy using androgen receptor antagonist ARN-509, abiraterone acetate, prednisone, degarelix, and indomethacin may fight prostate cancer by lowering the amount of androgen the body makes and/or blocking the use of androgen by the tumor cells.

Detailed Study Description

PRIMARY OBJECTIVES: I. The rate of the pathologic complete response (pCR) (i.e. no evidence of residual tumor) as assessed on prostatectomy specimens following 3-months (12 weeks) of neoadjuvant androgen receptor antagonist ARN-509 (ARN-509), abiraterone acetate, degarelix and indomethacin. SECONDARY OBJECTIVES: I. To determine the negative margin rate as assessed on prostatectomy specimens following 3-months (12 weeks) of neoadjuvant ARN-509, abiraterone acetate, degarelix and indomethacin. II. To determine the rate of near pCR (i.e. =< 5 mm of residual tumor) as assessed on prostatectomy specimens following 3-months (12 weeks) of neoadjuvant ARN-509, abiraterone acetate, degarelix and indomethacin. III. To determine the rate of pathologic T3 disease as assessed on prostatectomy specimens following 3-months (12 weeks) of neoadjuvant ARN-509, abiraterone acetate, degarelix and indomethacin. IV. To determine the rate of nodal metastases as assessed on surgical lymph node specimens following 3-months (12 weeks) of neoadjuvant ARN-509, abiraterone acetate, degarelix and indomethacin. V. To determine the apoptotic index (i.e. percentage of tumor cells undergoing apoptosis) as determined by cleaved caspase-3 immunohistochemistry following 3-months (12 weeks) of neoadjuvant ARN-509, abiraterone acetate, degarelix and indomethacin. VI. To determine the proportion of men who receive adjuvant radiation therapy within 1-year of prostatectomy. VII. To determine the biochemical (i.e. prostate-specific antigen [PSA]) progression free survival estimate two years after the last patient has accrued (i.e. confirmed PSA post-radical prostatectomy >= 0.2 ng/mL). VIII. To determine the overall survival estimate two years after the last patient has accrued. IX. Safety as assessed by the incidence and severity of adverse events and serious adverse events graded according to the National Cancer Institute - Common Terminology Criteria for Adverse Events (CTCAE) version 4.0. X. Exploratory biomarker assessment. OUTLINE: Patients receive androgen receptor antagonist ARN-509 and abiraterone acetate orally (PO) daily, prednisone PO twice per day (BID) and indomethacin PO three times per day (TID). Patients also receive degarelix subcutaneously (SC) on day 1 and every 4 weeks for 3 doses. Treatment continues for up to 12 weeks in the absence of disease progression or unacceptable toxicity. Patients undergo prostatectomy on day 85. After completion of study treatment, patients are followed up at 28, 113, 450 and 815 days.

Clinical Study Identifier: NCT02849990

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Michael Schweizer

Fred Hutch/University of Washington Cancer Consortium
Seattle, WA United States
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