<s>[INST] context: .External radiotherapy is given over the breast area, axilla (in selected patients like if axillary dissection is not done or more than 4 positive axillary nodes), internal mammary and supraclavicular area * Total dosage 5000 cGY units * 200-cGY units daily 5 days a week for 6 weeks.indications for radiation therapy for carcinoma breat includes * After total mastectomy, external irradiation is given to axilla. * Patients with higher risk of local relapse after surgery: - a. Invasive carcinoma. b. Extensive in situ carcinoma. c. Patients under 35 years. d. With multifocal disease. * In bone secondaries, to palliate pain and swelling. If there is pathological fracture in the bone, internal fixation has to be done along with external irradiation. * Inflammatory carcinoma of breast. * In atrophic scirrhous carcinoma of breast, as a curative radiotherapy. * As preoperative radiotherapy, to reduce the tumour size and downstage the tumour, so that the operability is better. * More than 4 positive lymph nodes in the axilla, pectoral fascia involvement, positive surgical margins, extranodal spread or in patients with axillary status not known/not assessed. ref:SRB&;s manual of surgery,ed 3,pg no 485 [/INST] question: Radiotherapy after mastectomy would not be required in which of the following case scenarious of breast ca | options: A: Large tumor B: Metastasis C: Axillary nodal involvement D: Positive margins | answer: B </s>