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NCI Dictionary of Cancer Terms


stage IA breast cancer  listen  (... brest KAN-ser)

  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.

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Stage I breast cancer. Drawing shows stage IA on the left; the tumor is 2 cm or smaller and has not spread outside the breast. Drawings in the middle and on the right show stage IB. In the drawing in the middle, no tumor is found in the breast, but small clusters of cancer cells are found in the lymph nodes. In the drawing on the right, the tumor is 2 cm or smaller and small clusters of cancer cells are found in the lymph nodes.