Patients to be included in this study will be pre-operatively staged according to American Joint Committee on Cancer (AJCC) 7th edition, International Union against cancer ( which uses TNM staging ) as stage I-III of breast carcinoma. Total 500 patients of histologically proven post lumpectomy/mastectomy cases of carcinoma breast suitable for radiotherapy will be enrolled in this study. Patients would be evaluated at the Department of Radiotherapy PGIMER, Chandigarh by doing a thorough clinical examination followed by routine investigations which will include hemogram, liver function tests, kidney function tests, chest X-ray. Patients will be treated by standard rectangular tangential fields.