Breast cancer is conservatively treated by following methods

Breast conservation surgery The amount of breast tissue excised with the lesion may vary with the clinical situation, but is typically 5mm to 10mm in all directions BCS may consist of removal of tumor with 1 cm margin of normal tissue (wide local excision) or a more extensive excision of a whole quadrant of breast (Quandrantectomy) Ref: Mastery of Surgery 5th edition Pgno : 525