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Delayed Administration Of Dexrazoxane Provides Cardioprotection For Patients With Advanced Breast Cancer Treated With Doxorubicin-containing Therapy.

S. Swain, F. Whaley, M. Gerber, M. Ewer, J. Bianchine, R. Gams
Published 1997 · Medicine

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PURPOSE To assess whether dexrazoxane (DZR) given after a cumulative doxorubicin dose of 300 mg/m2 confers cardioprotection in patients with advanced breast cancer treated with fluorouracil, doxorubicin, and cyclophosphamide (FAC). PATIENTS AND METHODS In two multicenter studies (088001 and 088006), patients were randomized to receive FAC and placebo (PLA) versus FAC and DZR. After a protocol amendment, all patients received open-label DZR after they had reached a cumulative doxorubicin dose of 300 mg/m2. Two groups were compared: 99 patients randomized to the PLA arms before the amendment who received FAC and PLA for at least seven courses (PLA group), and 102 patients randomized to the PLA arms after the amendment who received FAC and PLA for six courses followed by open-label DZR (PLA/DZR group). RESULTS The hazards ratio of PLA to PLA/DZR was 3.5 (95% confidence interval [CI], 2.2 to 5.7; P < .001, logrank and generalized Wilcoxon tests) for the doxorubicin dose at any cardiac event, ejection fraction changes, or congestive heart failure (CHF). The hazards ratio of PLA to PLA/DZR was 13.1 (95% CI, 3.7 to 46.0; P < .001, logrank and generalized Wilcoxon tests) for the doxorubicin dose at the development of CHF. The overall incidence of CHF in the PLA/DZR group was 3%, compared with 22% in the PLA group (P < .001, Fisher's exact test). Twenty-six percent of PLA/DZR patients received at least 15 courses of therapy, compared with 5% of patients in the PLA group. These results do not appear to be attributable to a time trend. CONCLUSION DZR is a highly effective cardioprotective agent when used in patients with advanced breast cancer who continue to receive doxorubicin-based chemotherapy after a cumulative doxorubicin dose of 300 mg/m2 has been reached.
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