Stage IA and IB

tumor less than or equal to 2 cm; the cancer has not spread outside the breast; no lymph nodes involved (IA) OR
no tumor in the breast; instead, small groups of cancer cells greater than 0.2 mm but not greater than 2 mm are found in the lymph nodes (IB) OR
tumor in the breast less than 2 cm AND small groups of cancer cells greater than 0.2 mm but not greater than 2 mm in the lymph nodes (IB)

total mastectomy; radiation after mastectomy only rarely needed

OR

lumpectomy plus radiation

OR

very occasionally, lumpectomy alone, with or without internal radiation -- only for a limited subset of women

axillary lymph node removal by traditional approach

OR

by sentinel approach, also known as sentinel lymph node dissection (preferred approach for people without enlarged nodes)

chemotherapy may be given to reduce the risk of recurrence

hormonal therapy used for people with hormone-receptor-positive cancer

targeted therapy may be used for women with cancers that have certain characteristics (for example, cancers with too many HER2 receptors)

does not apply