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Progression-free survival by treatment arm in (A) human epidermal growth factor receptor 2–negative and (B) –positive tumors. (A) Hazard ratio (HR), 1.00; 95% CI, 0.76 to 1.30; interaction-term (A and B combined) P = .53. (B) HR, 1.23; 95% CI, 0.69 to 2.18.
