Pathologic M
This input is used for staging
Notes
**Note 1:** In-transit metastasis are coded in N (regional lymph nodes). **Note 2:** Nodes in contiguous (secondary) and bidirectional (cephalad/caudal) primary nodal basins are coded in N (regional lymph nodes).NAACCR Item
NAACCR #900| Pathologic M | Pathologic M Display | Description | Registrar Notes |
|---|---|---|---|
| c0 | cM0 | No distant metastasis | Unknown; distant metastasis not stated Distant metastasis cannot be assessed Not documented in patient record |
| c1 | cM1 | Distant metastasis | CLINICAL assessment only: Note: M1 has subcategories of M1a, M1b and M1c. Assign M1 only when there is no information available to assign one of the subcategories Distant metastasis, NOS Stated as M1 [NOS] |
| c1A | cM1a | Skin, subcutaneous tissues or non-regional lymph node(s) | CLINICAL assessment only: Distant lymph node(s) Metastasis to skin or subcutaneous tissue Stated as M1a |
| c1B | cM1b | Lung | CLINICAL assessment only: Metastasis to lung plus distant lymph node(s) or skin or subcutaneous tissue Stated as M1b |
| c1C | cM1c | Other site(s) | CLINICAL assessment only: Distant metastasis to all other visceral sites WITH or WITHOUT distant lymph node(s), skin or subcutaneous tissue, or lung Carcinomatosis Stated as M1c |
| p1 | pM1 | Distant metastasis | HISTOLOGICALLY confirmed: Note: M1 has subcategories of M1a, M1b and M1c. Assign M1 only when there is no information available to assign one of the subcategories Distant metastasis, NOS |
| p1A | pM1a | Skin, subcutaneous tissues or non-regional lymph node(s) | HISTOLOGICALLY confirmed: Distant lymph node(s) Metastasis to skin or subcutaneous tissue |
| p1B | pM1b | Lung | HISTOLOGICALLY confirmed: Metastasis to lung plus distant lymph node(s) or skin or subcutaneous tissue |
| p1C | pM1c | Other site(s) | HISTOLOGICALLY confirmed: Distant metastasis to all other visceral sites WITH or WITHOUT distant lymph node(s), skin or subcutaneous tissue, or lung Carcinomatosis |
| 88 | 88 | Not applicable | Death certificate only (DCO) case |
| <BLANK> | BLANK | See Registrar Notes | Pathologic classification criteria not met No pathologic workup for T and N categories and no pathologic evidence of metastasis Only Pathologic Stage Group documented (no T, N, or M information available) |