Breast Cancer: Stages | dickey-med.info - T1a breast
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Clin Breast Cancer. Apr;5(1) Management of T1a breast cancer. Kiel KD(1). Author information: (1)Department of Radiation, Northwestern. T1: The tumor in the breast is 20 millimeters (mm) or smaller in size at its widest area. This is a little less than an inch. This stage is then broken into 4 substages.