Evaluation of the Feasibility of a Study Comparing Local Anesthesia and General Anesthesia in Conservative Surgery for Breast Cancer

Inclusion Criteria: * Female over 18 years of age * Diagnosis of invasive breast cancer (histological proof via breast biopsy) * Tumor size less than or equal to clinical T2 according to the current cTNM classification for breast cancer" * No clinical and/or radiological evidence of lymph node involvement * Affiliation to a French social security scheme or beneficiary of such a scheme * Approval in the multidisciplinary tumor board meeting for conservative treatment with partial mastectomy combined with sentinel lymph node biopsy * Signed informed consent indicating that the patient understands the purpose and procedures required by the study and agrees to participate in the study and comply with its requirements and restrictions Exclusion Criteria: * Severe and morbid obesity (BMI strictly greater than 35) * Emaciation (BMI strictly less than 18.5) * Contraindication to the medications used in the protocol * Contraindication to general anesthesia * Contraindication to the local anesthesia protocol * Tumor considered non-resectable under local anesthesia according to the surgeon's assessment * Bifocal tumor * Associated oncoplastic procedure * Contralateral surgical procedure (implantable port placement, mastopexy, partial or total mastectomy) * Withdrawal of consent prior to surgery * Legal incapacity or limited legal capacity * Non-fluency in the French language or poor understanding as anticipated by the investigator * Subject without health insurance * Pregnant woman * Subject currently in the exclusion period of another study or listed in the national volunteer registry