Monotherapy with docetaxel in second- or third-line treatment of anthracycline-resistant metastatic breast cancer.
Nineteen breast cancer patients pretreated with one or two anthracycline-containing regimens for visceral metastases received i.v. docetaxel 100 mg/m2 on day 1, q 21d. Docetaxel was administered as second-line therapy in 11 patients, whereas eight patients received docetaxel in a third-line setting. In the second-line setting, complete response (CR) was achieved in two (18%), partial response (PR) in four (36%) and stable disease (SD) in three (27%) patients resulting in a response rate (RR) of 54%. In the third-line setting three (38%) patients experienced PR (RR 38%) and two (25%) SD. In the second-line setting, median time to progression was 6.5+/-3.9 months (range 2.1-15.8) versus 4.7+/-5.5 months (range 0.6-15.9) in the third-line setting. Median overall survival was 9.6+/-8.0 months (range 2.7-25.8) versus 11.2-6.1 months (range 4.8-18.7). Overall, no patient experienced treatment-limiting toxicities. We conclude that docetaxel induced responses in 48% of anthracycline-resistant patients enrolled into the present study. The safety profile of docetaxel was manageable and tolerable. Docetaxel represented efficacious treatment in patients with metastatic breast cancer progressing despite previous anthracycline-containing chemotherapy.