A prospective randomized phase III trial comparing combination chemotherapy with cyclophosphamide, fluorouracil, and either doxorubicin or epirubicin. French Epirubicin Study Group.

Two hundred sixty-three patients with advanced breast cancer were randomized to two treatment regimens consisting of fluorouracil, 500 mg/m2; cyclophosphamide, 500 mg/m2; and either epirubicin (Farmorubicin, Farmitalia Carlo Erba SpA, Italy), 50 mg/m2 (FEC); or doxorubicin (Adriamycin, Adria Laboratories, Columbus, OH), 50 mg/m2 (FAC), administered intravenously (IV) every 3 weeks. Two hundred thirty patients (FAC, 113; FEC, 117) were evaluable for response, and 244 patients for toxicity (FAC, 120; FEC, 124). The two groups were comparable with respect to age, menopausal status, disease-free interval to first recurrence, time from initial diagnosis to protocol activation, indicator lesions, performance status, and prior adjuvant therapy. Of 117 evaluable patients treated with FEC, 59 (50.4%) had a partial response (PR) or complete response (CR), 40 showed no change (NC), and 18 had progressive disease. Of 113 evaluable patients treated with FAC, 54 (52%) showed a remission, 30 NC, and 18 progression. There was no statistical difference between the two regimens in overall response rate, response rate according to tumor site, time to response, or duration of response. Median survival was 15 months for FEC and 18.2 months for FAC (not significant). In the 120 patients evaluable for toxicity treated with FAC, three episodes of congestive heart failure (CHF) were observed after 225, 350, and 550 mg/m2 of doxorubicin, respectively. Of the 124 evaluable patients treated with FEC, 25 received greater than 600 mg/m2 of epirubicin and no CHF was recorded. FEC induced significantly less neutropenia (P = .01), less nausea and vomiting (P less than .01), and less complete alopecia (P less than 10(-3) than did FAC. The results of this study demonstrate that FEC is as effective a regimen as FAC for the therapy of advanced breast cancer. Moreover, FEC was better tolerated than FAC in this patient population.