Prospective evaluation of paclitaxel versus combination chemotherapy with fluorouracil, doxorubicin, and cyclophosphamide as neoadjuvant therapy in patients with operable breast cancer

Purpose: To compare prospectively the antitumor activity of single-agent paclitaxel to the three-drug combination of fluorouracil, doxorubicin, and cyclophosphamide (FAC) as neoadjuvant therapy in patients with operable breast cancer. Patients and Methods: Patients with T1-3N0-1M0 disease were randomized to receive either paclitaxel (250 mg/m(2)) as 24-hour infusion or FAC in standard doses at every-3-week intervals. Each patient was treated with four cycles of preoperative chemotherapy. Clinical response and extent of residual disease in the breast and lymph nodes war assessed after four cycles of induction chemotherapy. Results: A total of 174 patients were registered, and 87 were randomized to each arm of the study Clinical response, ie, complete and partial responses, was similar in both arms of the study. Three patients in the PAC arm and one patient in the paclitaxel subgroup had progressive disease. The extent of residual disease by intent-to-treat analysis at the time of surgery was similar between the two arms of the study. Conclusion: The results of this prospective study demonstrated that single-agent paclitaxel as neoadjuvant therapy has significant antitumor activity, and this was clinically comparable to FAC. Similar fractions of patients had clinical complete and partial responses, and very few patients had no response to either therapy. The value of alternate non-cross-resistant therapies as used in this protocol on the clinical course of this disease would require longer follow-up. (C) 1999 by American Society of Clinical Oncology.