Combination chemotherapy following adrenal suppression in androgen- independent prostate cancer.
OBJECTIVE
Recent trials with modern chemotherapy have demonstrated activity in androgen-independent prostate cancer, but all focused on patients with progression following androgen suppression or antiandrogen withdrawal. Limited data are available on the activity of chemotherapy in androgen-independent, hormone-refractory (progressing following adrenal suppression) prostate cancer. We evaluated the activity of estramustine combined with vinblastine in this subset of androgen-independent prostate cancer.


METHODS
From January 1995 until April 1999, 19 patients with hormone-refractory prostate cancer received estramustine 140 mg p.o., three times daily along with weekly vinblastine 5 mg/m(2).


RESULTS
A decrease in prostate-specific antigen of 50% or more was noted in 12 patients (63.1%, 95% CI 38.3-83.7%). The median decrease in prostate-specific antigen was 71.2% (range 50.5-85.2%). None of the 7 patients with measurable soft-tissue disease showed an objective response. The median survival from onset of chemotherapy was 6 (range 1.4-27.7) months and from initiation of adrenal suppression 16.9 (range 3.8-40. 5) months.


CONCLUSIONS
The combination of estramustine and vinblastine is capable of inducing activity in androgen-independent prostate cancer progressing after adrenal suppression. In our small sample, the survival rate was low, and we obtained no response in soft-tissue sites. Future prospective trials are needed to determine the benefit of sequential versus simultaneous incorporation of adrenal suppression with chemotherapy in the management of androgen-independent prostate cancer.
Sella
A
A
Department of Oncology, Rabin Medical Center, Beilinson Campus, Petah Tikva, and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel. avisella@netvision.net.il
Flex
D
D
Konichezky
M
M
Sulkes
A
A
Baniel
J
J
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000726:Androgen Antagonists / Q000627:therapeutic use*; D000728:Androgens; D018931:Antineoplastic Agents, Hormonal / Q000008:administration & dosage; D000972:Antineoplastic Agents, Phytogenic / Q000008:administration & dosage; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D004961:Estramustine / Q000008:administration & dosage; D006801:Humans; D008297:Male; D008875:Middle Aged; D011471:Prostatic Neoplasms / Q000188:drug therapy* / Q000401:mortality; D015996:Survival Rate; D014747:Vinblastine / Q000008:administration & dosage
D000726:Androgen Antagonists; D000728:Androgens; D018931:Antineoplastic Agents, Hormonal; D000972:Antineoplastic Agents, Phytogenic; D004961:Estramustine; D014747:Vinblastine