In stage II breast cancer, the tumor is determined as being less than 2 cm and/or lymph nodes under the arm involved (IIA) or the tumor is greater than 2 cm but less than 5 cm and lymph nodes involved (IIB). The final option is that the tumor is greater than 5 cm but no lymph nodes are involved (IIB).
The treatment for stage II breast cancer can vary.
It may involve a modified radical mastectomy, and radiation following the mastectomy may be necessary.
Another option is a lumpectomy plus radiation. Auxillary lymph node removal may be necessary, as is, on occasion, sentinel lymph node dissection. The latter would be for those without enlarged nodes.
Chemotherapy is commonly recommended during this stage, and hormonal therapy may be used for those with hormone-receptor-positive cancer.
https://www.empowher.com/breast-cancer/content/stage-two-breast-cancer?page=0,1