Pemetrexed as Second-Line Therapy in Treating Patients With Hormone Refractory Prostate Cancer

Study Summary

Docetaxel-based therapy has been shown to prolong survival as first-line therapy for patients with hormone refractory prostate cancer (HRPC), and has become the standard of care. The beneficial effects of any therapy in HRPC may be diverse and include reduction in tumor bulk (when measurable), reduction in prostate-specific antigen PSA, reduction in symptoms (particularly pain), or stabilization of disease. Clear reductions in tumor bulk or PSA may provide objective evidence of a treatment effect, and stabilization of disease may be just as clinically meaningful in patients who are actively progressing prior to starting therapy. Pemetrexed has shown a broad array of activity in many diseases that until now were thought to be non-responsive to chemotherapy in the second-line setting. This trial is designed to further assess the efficacy, safety, tolerability, and pharmacogenetics of pemetrexed as a single agent in subjects with HRPC whose disease has progressed following one prior taxane-based chemotherapy regimen for HRPC.

Primary Outcome

Best overall Prostate-Specific Antigen (PSA) response PSA response is defined by a greater than or equal to 50% decline in PSA confirmed by a second PSA value at least 4 weeks after the first PSA response timepoint PSA Stable Disease is defined as less than a 50% decline in PSA and less than a 50% increase in PSA from baseline PSA progression is defined as greater than or equal to a 50% increase in PSA compared to baseline

Conditions Studied

Interventions

• DRUG Pemetrexed
• DIETARY_SUPPLEMENT Vitamin B12
• DIETARY_SUPPLEMENT Folic Acid

Study Locations (15)