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Disease-free survival by cyclophosphamide, doxorubicin, and fluorouracil (CAF) dose in HER2 amplified and nonamplified tumors. Kaplan-Meier estimates were calculated using SAS 9.1 for disease-free survival by CAF dose (low, moderate, high) for HER2 amplified versus HER2 nonamplified tumors. P = .079, interaction term for the three arms.
