Clinical M

This input is used for staging

Notes

**Note 1:** Distant lymph nodes are assigned as M1b. **Distant lymph nodes** Inferior mesenteric lymph nodes Superior mesenteric lymph nodes **Note 2:** Mucinous tumors (morphology codes 8480, 8481, and 8490) with peritoneal involvement confined to the right lower quadrant (RLQ) are classified as T4a and are assigned in T (primary tumor).

NAACCR Item

NAACCR #960
Clinical M Clinical 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

Stated as M1 [NOS]
c1A cM1a Intraperitoneal metastasis beyond the right lower quadrant, including pseudomyxoma peritonei CLINICAL assessment only:
For mucinous tumors only:
Intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei

Stated as M1a
c1B cM1b Non-peritoneal metastasis CLINICAL assessment only:
Distant lymph nodes, NOS

For mucinous tumors only:
Distant lymph node(s) plus intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei

For non-mucinous tumors only:
Any intraperitoneal spread

Intraperitoneal spread plus distant lymph node(s)

Non-peritoneal metastasis
Carcinomatosis

Distant metastasis WITH or WITHOUT distant lymph node(s)

Distant metastasis, NOS

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
p1A pM1a Intraperitoneal metastasis beyond the right lower quadrant, including pseudomyxoma peritonei HISTOLOGICALLY confirmed:
For mucinous tumors only:
Intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei
p1B pM1b Non-peritoneal metastasis HISTOLOGICALLY confirmed:
Distant lymph nodes, NOS

For mucinous tumors only:
Distant lymph node(s) plus intraperitoneal metastasis BEYOND the right lower quadrant, including pseudomyxoma peritonei

For non-mucinous tumors only:
Any intraperitoneal spread

Intraperitoneal spread plus distant lymph node(s)

Non-peritoneal metastasis
Carcinomatosis

Distant metastasis WITH or WITHOUT distant lymph node(s)

Distant metastasis, NOS
88 88 Not applicable Primary site/histology not TNM defined
Death certificate only (DCO) case
<BLANK> BLANK See Registrar Notes Clinical classification criteria not met
Clinical classification criteria met, evaluation done:
No information about diagnostic workup
Results not documented in patient record
Clinical evaluation of T and N not done, no evidence metastatic disease
Tumor first detected on surgical resection (no clinical workup)
Only Clinical Stage Group documented (no T, N, or M information available)