Stage III is divided into stages IIIA, IIIB, and IIIC. In stage IIIA, (1) no tumor is found in the breast or the tumor may be any size. Cancer is found in 4 to 9 axillary lymph nodes or in the lymph nodes near the breastbone (found during imaging tests or a physical exam); or (2) the tumor is larger than 5 centimeters. Small clusters of breast cancer cells (larger than 0.2 millimeter but not larger than 2 millimeters) are found in the lymph nodes; or (3) the tumor is larger than 5 centimeters. Cancer has spread to 1 to 3 axillary lymph nodes or to the lymph nodes near the breastbone (found during a sentinel lymph node biopsy). In stage IIIB, the tumor may be any size and cancer has spread to the chest wall and/or to the skin of the breast and caused swelling or an ulcer. Also, cancer may have spread to: (1) up to 9 axillary lymph nodes; or (2) the lymph nodes near the breastbone. Cancer that has spread to the skin of the breast may also be inflammatory breast cancer. In stage IIIC, no tumor is found in the breast or the tumor may be any size. Cancer may have spread to the skin of the breast and caused swelling or an ulcer and/or has spread to the chest wall. Also, cancer has spread to: (1) 10 or more axillary lymph nodes; or (2) lymph nodes above or below the collarbone; or (3) axillary lymph nodes and lymph nodes near the breastbone. Cancer that has spread to the skin of the breast may also be inflammatory breast cancer. For treatment, stage IIIC breast cancer is divided into operable and inoperable stage IIIC.