My cousin underwent a BCS for suspected CA-right breast in Jul 2014. Since the tumor tested positive, an oncosurgeon performed an MRM in the same month. The histopath report mentioned that one out of the 3 sentinel nodes showed presence of metastatic tumor. Staging was T1N1M0, the tumor was ER+/PR+, grade 3. Rest of the findings were - IDC with lobular growth pattern Mod RB score 3+3+2=8, desmoplasia, elastosis, microcalcification present, ductal carcinoma with EIC and criiniform type w/o necrosis. She was later given chemotherapy - dose dense Taxol protocol. The question is whether radiotherpay is necessary?
Thanks in advance.