Pathologic M
This input is used for staging
Notes
**Note:** The term "skip metastasis" is not used with a consistent meaning in the literature. In some cases, it refers to discontinuous metastasis in the same bone as the primary tumor, while in other cases it refers to discontinuous metastasis in an adjacent bone, usually in the same limb. For TNM staging, discontinuous metastasis in the same bone is classified as T3 (coded in primary tumor), and discontinuous metastasis in an adjacent bone is classified as M1b (coded in distant metastasis). * If a primary bone tumor is stated as having "skip metastasis" or "skip lesions" with no other information regarding the bone involved, assign T3 in primary tumorNAACCR 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 and M1b. Assign M1 only when there is no information available to assign one of the subcategories. Distant metastasis, NOS Stated as M1[NOS] |
| c1A | cM1a | Lung | CLINICAL assessment only: Distant metastasis to lung only Stated as M1a |
| c1B | cM1b | Other distant sites | CLINICAL assessment only: Distant lymph nodes, NOS Distant metastasis WITH or WITHOUT distant lymph node(s) Distant metastasis WITH or WITHOUT lung mets Carcinomatosis Stated as M1b |
| p1 | pM1 | Distant metastasis | HISTOLOGICALLY confirmed: Note: M1 has subcategories of M1a and M1b. Assign M1 only when there is no information available to assign one of the subcategories. Distant metastasis, NOS |
| p1A | pM1a | Lung | HISTOLOGICALLY confirmed: Distant metastasis to lung only |
| p1B | pM1b | Other distant sites | HISTOLOGICALLY confirmed: Distant lymph nodes, NOS Distant metastasis WITH or WITHOUT distant lymph node(s) Distant metastasis WITH or WITHOUT lung mets Carcinomatosis |
| 88 | 88 | Not applicable | Primary site/histology not TNM defined 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) |