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Clinical Genitourinary Cancer 2009-Jan

Oral fenretinide in biochemically recurrent prostate cancer: a California cancer consortium phase II trial.

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Eric Cheung
Jacek Pinski
Tanya Dorff
Susan Groshen
David I Quinn
C Patrick Reynolds
Barry J Maurer
Primo N Lara
Denice D Tsao-Wei
Przemyslaw Twardowski

Ключови думи

Резюме

BACKGROUND

Fenretinide is a synthetic retinoid that is cytotoxic to a variety of cancers. We conducted a phase II trial of oral fenretinide in patients with biochemically recurrent prostate cancer.

METHODS

Eligible patients had histologically confirmed prostate cancer and a confirmed rising prostate-specific antigen (PSA) >or= 2 ng/mL following either radical prostatectomy and/or pelvic radiation therapy, without clinical or radiographic evidence of metastasis. The primary endpoint was PSA response, which was defined as a confirmed decrease by >or=50%, and >or=5 ng/mL, from the pretreatment value. Treatment comprised oral fenretinide 900 mg/m2 twice daily for 1 week, every 3 weeks, for 1 year.

RESULTS

After a median follow-up of 17.7 months, out of 23 patients, 7 (30%) patients had PSA stable disease (SD), 11 (48%) patients had PSA progression within 3 months, 4 patients had minimal increases over 3 months that did not qualify as SD or progression (17%), and one patient (4%) was not evaluable. Median time to PSA progression was 4.6 months (95% CI, 3.2-8.2 months). Observed grade 3 toxicities included fatigue, pain, hypermagnesemia, a rise in lipase, and nyctalopia.

CONCLUSIONS

Although well-tolerated, oral fenretinide did not meet prespecified PSA criteria for response in biochemically recurrent prostate cancer; however, 30% of patients had SD, which suggests modest single-agent clinical activity. The role of different formulations of fenretinide, which might allow for higher serum concentrations of the drug, is currently under investigation.

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