Distant metastases M

Mx—presence of distant metastases cannot be assessed. M0—no distant metastases. M1—distant metastases.

The category M1 is often subdivided according to the following notation:

Pulmonary—PUL.

Osseous—OSS.

Hepatic—HEP.

Peritoneum—PER.

Using this methodology it is possible to assign a TNM class to any patient.

Specific rules for each subset of tumour type are published by the International Union Against Cancer (UICC) and the American Joint Committee on Cancer (AJCC).

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