From: Hypopharyngeal Cancer Treatment (Adult) (PDQ®)
PDQ Cancer Information Summaries [Internet].
Bethesda (MD): National Cancer Institute (US); 2002-.
NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.
Table 3. Definitions of Distant Metastasis (M)a
| M Category | M Criteria |
|---|---|
| M0 | No distant metastasis. |
| M1 | Distant metastasis. |
aReprinted with permission from AJCC: Oropharynx (p16-) and Hypopharynx. In: Amin MB, Edge SB, Greene FL, et al., eds.: AJCC Cancer Staging Manual. 8th ed. New York, NY: Springer, 2017, pp 123–35.