The NCI Dictionary of Cancer Terms features 7,804 terms related
to cancer and medicine.
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Stage I is divided into stages IA and IB. 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: (1) no tumor is found in the breast; or (2) the tumor is 2 centimeters or smaller.