Changes in re-excision rates after publication of guidelines defining positive margins for breast-conserving surgery: a collaborative study of the Japanese breast cancer society. - Sakai T; Kimura Y; Ishitobi M; Yoshida A; Sagara Y; Ono Y; Takada K; Takahashi Y; Tsukioki T; Kimoto M; Osako T (Breast cancer (Tokyo, Japan), 2026)