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 tumor

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 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)