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Kaplan–Meier curves for disease-free survival between young adult (<35 years; red line), middle-aged adult (35–50 years; blue line), and older adult (>50 years; green line) patients with a HER2-negative/ER-positive, b HER2-positive/ER-positive, c HER2-positive/ER-negative, and d triple receptor negative breast cancer. P-values were calculated using a log-rank test
