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    Male Breast Cancer Treatment (PDQ®): Treatment - Patient Information [NCI] - Stages of Male Breast Cancer

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    Pea, peanut, walnut, and lime show tumor sizes.

    Stage I

    In stage I, cancer has formed. Stage I is divided into stages IA and IB.

    • In stage IA, the tumor is 2 centimeters or smaller. Cancer has not spread outside the breast.
    • In stage IB, small clusters of breast cancer cells (larger than 0.2 millimeter but not larger than 2 millimeters) are found in the lymph nodes and either:
      • no tumor is found in the breast; or
      • the tumor is 2 centimeters or smaller.

    Stage II

    Stage II is divided into stages IIA and IIB.

    • In stage IIA
      • no tumor is found in the breast or the tumor is 2 centimeters or smaller. Cancer (larger than 2 millimeters) is found in 1 to 3 axillary lymph nodes or in the lymph nodes near the breastbone (found during a sentinel lymph node biopsy); or
      • the tumor is larger than 2 centimeters but not larger than 5 centimeters. Cancer has not spread to the lymph nodes.
    • In stage IIB, the tumor is:
      • larger than 2 centimeters but not 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
      • larger than 2 centimeters but not 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); or
      • larger than 5 centimeters. Cancer has not spread to the lymph nodes.

    Stage IIIA

    In stage IIIA:

    • 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
    • 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
    • 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).
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