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Primary tumor (T) |
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Tx | Primary tumor cannot be assessed |
T0 | No evidence of primary tumor |
Tis | In situ primary tumor |
T1 | Primary tumors less than or equal to 2 cm maximum tumor dimension |
T2 | Primary tumors greater than 2 cm but not more than 5 cm maximum tumor dimension |
T3 | Primary tumors over 5 cm maximum tumor dimension |
T4 | Primary tumor invades bone, muscle, fascia, or cartilage |
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Regional lymph nodes (N) |
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Nx | Regional lymph nodes cannot be assessed |
N0 | No regional lymph node metastasis |
cN0 | Nodes negative by clinical exam (no pathologic node exam performed) |
pN0 | Nodes negative by pathologic exam |
N1 | Metastasis in regional lymph node(s) |
N1a | Micrometastasis |
N1b | Macrometastasis |
N2 | In-transit metastasis |
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Distant metastasis (M) |
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M0 | No distant metastasis |
M1 | Metastasis beyond regional lymph nodes |
M1a | Metastasis to skin, subcutaneous tissues, or distant lymph nodes |
M1b | Metastasis to lung |
M1c | Metastasis to all other visceral sites |
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Anatomic stage/prognostic groups |
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IA | Primary tumor ≤2 cm; regional LN negative by pathologic examinationa |
IB | Primary tumor ≤2 cm; regional LN negative by clinical examination onlyb |
IIA | Primary tumor >2 cm; regional LN negative by pathologic examinationa |
IIB | Primary tumor >2 cm; regional LN negative by clinical examination onlyb |
IIIA | Primary tumor any size; positive micrometastasis in regional LNc |
IIIB | Primary tumor any size; clinically detectable regional LN metastasis and/or in-transit metastasisd |
IV | Primary tumor any size; any distant metastasis |
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