My mother is a diagnosed case of carcinoma right breast. Her surgery has been done on 28.05.2017. N her infected breast has been removed completely and also in pet/whole body scan it has been found that cancer is not spread to other part of body. After surgery they did biopsy report where it is found that In my mother breast cancer cell her 2/neu is 3+ and comment Her 2 gene amplification issue at18-20% of invasive breast cancer as per biopsy report. Staging is-mpT2N0Mx. The consulting doctor has said that in her case only chemotherapy is required no radiation required but now after last 6th chemotherapy over on 11.10.3017 he said that radiation will also be done. It will take 3 week 5 days in each week? Pls Sir/mam guide why he is saying about radiation now? Is that for business or it really necessary. What is the side effect of radiation? Plss pls guide sir/mam. Thanks in advance.