Intraoperative radiotherapy versus whole breast radiotherapy in early-stage breast cancer: a retrospective outcome analysis based on ASTRO guidelines on PBI.

As depicted in Table 6 , a resection margin of less than 2 mm was associated with a greater risk of IBTR, while adjuvant radiotherapy type, BMI, age, ER/PR status, HER2 status, tumor size, histologic grade, and cancer histological type did not reach statistical significance in proving an association with IBTR risk.

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