BACKGROUND: Men with biochemical recurrence (BCR) of prostate cancer are typically observed or treated with androgen-deprivation therapy.
FREE DAILY AND WEEKLY NEWSLETTERS OFFERED BY CONTENT OF INTEREST
Did you find this article relevant? Subscribe to UroToday-GUOncToday!
The fields of GU Oncology and Urology are advancing rapidly including new treatments, enrolling clinical trials, screening and surveillance recommendations along with updated guidelines. Join us as one of our subscribers who rely on UroToday as their must-read source for the latest news and data on drugs. Sign up today for blogs, video conversations, conference highlights and abstracts from peer-review publications by disease and condition delivered to your inbox and read on the go.
Non-hormonal, non-toxic treatments to slow the rise of PSA are desirable. We studied a combination herbal supplement, Prostate Health Cocktail (PHC), in prostate cancer cell lines and in a population of men with BCR.
METHODS: PC3, LAPC3 and LNCaP cells were incubated with increasing concentrations of PHC suspension. Men previously treated for prostate cancer with surgery, radiation or both with rising PSA but no radiographic metastases were treated with three capsules of PHC daily; the primary end point was 50% PSA decline. Circulating tumor cells (CTCs) were identified using parylene membrane filters.
RESULTS: PHC showed a strong dose-dependent anti-proliferative effect in androgen-sensitive and independent cell lines in vitro and suppression of androgen receptor expression. Forty eligible patients were enrolled in the clinical trial. Median baseline PSA was 2.8 ng ml-1 (1.1-84.1) and 15 men (38%) had a PSA decline on study (1-55% reduction); 25 (62%) had rising PSA on study. The median duration of PSA stability was 6.4 months. Two patients had grade 2/3 transaminitis; the only other grade 2 toxicities were hyperglycemia, hypercalcemia and flatulence. There were no significant changes in testosterone or dihydrotestosterone. CTCs were identified in 19 men (47%).
CONCLUSIONS: Although the primary end point was not met, PHC was well tolerated and was associated with PSA declines and stabilization in a significant number of patients. We believe this is the first report of detecting CTCs in men with BCR prostate cancer. Randomized studies are needed to better define the effect of PHC in men with BCR.
Dorff TB, Groshen S, Tsao-Wei DD, Xiong S, Gross ME, Vogelzang N, Quinn DI, Pinski JK. Are you the author?
Keck School of Medicine, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA; Division of Biostatistics, Department of Preventive Medicine, Keck School of Medicine, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA; Division of Medical Oncology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA; Keck School of Medicine, Westside Prostate Cancer Center, Center for Applied Molecular Medicine, University of Southern California, Los Angeles, CA, USA; Comprehensive Cancer Centers of Nevada, Las Vegas, NV, USA; Division of Medical Oncology, Department of Medicine, Keck School of Medicine, Norris Comprehensive Cancer Center, University of Southern California, Los Angeles, CA, USA.
Reference: Prostate Cancer Prostatic Dis. 2014 Sep 23.