Stage IA

Invasive cancer confined to the original anatomic site of growth without lymph node involvement. The definition of stage IA depends on the particular type of cancer that it refers to; for example, for breast cancer, stage IA is defined as follows: T1, N0, M0. T1: Tumor 20 mm or less in greatest dimension. T1 includes T1mi. T1mi: Tumor 1 mm or less in greatest dimension. N0: No regional lymph node metastasis. M0: No clinical or radiographic evidence of distant metastasis. M0 includes M0(i+); for bone cancer, stage IA is defined as follows: T1, N0, M0, G1, G2, GX. T1: Tumor 8 cm or less in greatest dimension. N0: No regional lymph node metastasis. M0: No distant metastasis. G1: Well differentiated-low grade. G2: Moderately differentiated-low grade. GX: Grade cannot be assessed. (partially adapted from AJCC 7th ed.) (NCI Thesaurus)

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