Optimal Surgical Approach for Early-Stage Breast Cancer in Chinese Patients Aged ≤ 40 Years: a Cohort Study

Patients with early-stage (stage I, stage II, T≤2), and having the willingness to receive BCS were treated with BCS. All patients with BCS received post-surgery radiotherapy. Radiotherapy was administrated with a prescribed dose of 40 Gy in 15 fractions with photons and a boost of 10-16 Gy in 5-8 fractions with electrons to the ipsilateral breast. If axillary lymph nodes were involved, a conventional fraction was delivered with a prescribed dose of 50 Gy in 25 fractions to the ipsilateral breast and draining lymph node regions.