Survival and PSA Response of Patients in the TAX 327 Study Who Crossed over to Receive Docetaxel After Mitoxantrone or Vice Versa

Background: The TAX 327 study compared 3-weekly docetaxel, weekly docetaxel or 3-weekly mitoxantrone, each with prednisone, for 1006 patients with metastatic hormone-refractory prostate cancer. Survival and symptom control were superior following 3-weekly docetaxel as compared with mitoxantrone. At progression, many patients were treated with the other drug. Here, we provide a retrospective report of survival and prostate-specific antigen (PSA) response after second-line therapy.

Methods: The TAX 327 database provided information about treatment after progression on first-line therapy, and survival has been updated. Investigators were asked to provide information about crossover treatment and serial PSA values.

Results: We identified 232 crossover patients. Median survival after crossover was 10 months and did not depend on direction of crossover. Data on PSA response are available for 96 patients: PSA response (> or =50% reduction) occurred in 15% of 71 men receiving mitoxantrone after docetaxel and in 28% of 25 men receiving docetaxel after mitoxantrone. Median PSA progression-free survival was 3.4 months for mitoxantrone after docetaxel and 5.9 months for docetaxel after mitoxantrone.

Conclusions: One quarter of men received crossover therapy and survival was similar in the crossover groups. The PSA response rate to docetaxel after mitoxantrone was higher than that for mitoxantrone after docetaxel.