A
Carcinoma in situ, no demonstrable metastasis of the regional lymph nodes, and ascending degrees of distant metastasis
B
No evidence of primary tumor, no abnormal regional lymph nodes, and no evidence of distant metastasis
C
Can’t assess tumor or regional lymph nodes and no evidence of metastasis
D
Carcinoma in situ, no abnormal regional lymph nodes, and no evidence of distant metastasis