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a, b Kaplan–Meier curves for relapse-free and overall survival of all cases by tumor classification (cT-category). P values were calculated using the log-rank test. Tis: Non-invasive ductal carcinoma, lobular carcinoma in situ, or Paget disease; T1a: ≤0.5 cm; T1b: 0.5 < tumor ≤ 1.0 cm; T1c: 1.0 < tumor ≤ 2.0 cm, T2: 2.0 < tumor ≤ 5.0 cm; T3: > 5.0 cm; T4: tumor of any size with direct extension to the chest wall and/or skin (ulceration or skin nodules) or inflammatory carcinoma
