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)