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Abstract Title:

A phase II study of pomegranate extract for men with rising prostate-specific antigen following primary therapy.

Abstract Source:

J Clin Oncol. 2011 May 20 ;29(15_suppl):4522. PMID: 28023432

Abstract Author(s):

C J Paller, X Ye, P Wozniak, B Gillespie, P Sieber, R Greengold, B Stockton, B Hertzman, M Efros, R Roper, H Liker, M A Carducci

Article Affiliation:

C J Paller

Abstract:

: 4522^ Background: Pomegranate extract (POMx) demonstrates antitumor effects through antioxidants in prostate cancer (PCA). Prior work reveals an increase in PSA doubling time (PSADT) in a single arm study of pomegranate juice (POM) in PCA patients (pts) with a rising PSA after local therapy. We sought to determine the effects of 1 gram or 3 grams daily POMx on PSADT in a similar but more inclusive population of men seeking to defer androgen deprivation therapy.

METHODS: This multi-center, double bind phase II, dose-exploring trial randomized men with a rising PSA and without metastases to receive 1 gram or 3 grams of POMx, stratified by baseline PSADT and Gleason score, and with no restrictions for PSADT and no upper limit PSA value. Men were treated until progression or for 18 months. PSA levels were obtained every 3 months. This study was designed to detect a 6 month on study increase in PSADT from baseline on each arm.

RESULTS: 104 patients were enrolled and treated for up to 6 (92%), 12 (70%) and 18 months (36%). Median PSADT lengthened in the Intent to treat population (96% white, median age 74.5 years, median gleason score 7) from baseline 11.9 (range 1.6-54.6) compared to 18.5 (2-1523) months after treatment (p<.001).There was no significant treatment difference on PSADT between the dose groups (p=.920). Forty-three percent (41/95) of men had a post-treatment PSADT of more than 200% of baseline PSADT and no new metastases. Declining PSA levels were observed in 13 pts (13%) during the study. No significant changes occurred in testosterone in either group. Although no clinically significant toxicities were seen, mild to moderate diarrhea was seen in 8 percent of patients.

CONCLUSIONS: POMx treatment significantly increased the PSADT by over 6 months in both treatment arms, with no effect on testosterone. This IND-conducted study confirms slowing of PSADT with POMx as was found with POM, yet in a more inclusive PCA patient population.

Study Type : Human Study

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