Clinical Research Directory

Inclusion Criteria: * Female, aged ≥35 years, \<70 years * ECOG score: 0-2 * Having underwent breast-conserving surgery or Modified radical mastectomy with or without sentinel lymph node biopsy or axillary lymph node dissection * Pathologically confirmed primary breast cancer * For patients who did not receive neoadjuvant therapy: pathological staged pT0-2N0-1; for patients who received neoadjuvant therapy: staged ypT0-2N0-1 * Indicated for postoperative adjuvant radiotherapy, planned to undergo postoperative adjuvant radiotherapy * Able to cooperate and tolerate the treatment Exclusion Criteria: * Pathologically confirmed metastasis in supraclavicular or infraclavicular lymph nodes, or distant metastasis * History of radiotherapy to the neck or chest * Contraindications or intolerance to radiation therapy (such as pregnancy or lactation, severe impairment of heart, lung, kidney, liver, or other vital organ functions; severe infection or hematologic abnormalities; brachial plexus nerve injury on the affected side; active connective tissue diseases, etc.) * History of malignant tumors