Abstract:
BACKGROUND:PC-SPES is an herbal supplement whose mechanisms of action are poorly understood, but may be estrogenic. The objective of the current report is to describe the effects of discontinuing PC-SPES treatment in four patients with androgen-independent prostate carcinoma. METHODS:Patient charts were retrospectively reviewed. A MEDLINE search was performed to investigate whether these effects of PC-SPES had been previously reported. RESULTS:Four men whose metastatic prostate carcinoma progressed despite androgen ablation and subsequent PC-SPES treatment are described. All four patients developed a rapid increase in serum prostate specific antigen (PSA) within one month of stopping PC-SPES, ranging from 345% to 880%. Two patients increased their PSA levels to 1300% and 1400% after 7 weeks. Compared to the rate of rise of PSA levels prior to and during PC-SPES therapy, the rise after stopping this treatment was much higher than expected. Clinical symptoms remained relatively stable despite the serologic changes. CONCLUSIONS:Discontinuing PC-SPES therapy can be associated with a rapid rise in PSA. To the authors' knowledge, this effect has not been reported previously. This effect should be considered in the design of clinical trials as well as in the standard management of androgen-independent prostate carcinoma patients.
journal_name
Cancerjournal_title
Cancerauthors
Oh WK,George DJ,Kantoff PWdoi
10.1002/cncr.10269subject
Has Abstractpub_date
2002-02-01 00:00:00pages
686-9issue
3eissn
0008-543Xissn
1097-0142pii
10.1002/cncr.10269journal_volume
94pub_type
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