How is metastatic (M) involvement in non–small cell lung cancer (NSCLC) staged?

Updated: Jul 15, 2021
  • Author: Winston W Tan, MD, FACP; Chief Editor: Nagla Abdel Karim, MD, PhD  more...
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Metastatic (M) involvement is as follows:

  • M0 - No metastasis
  • M1 - Distant metastasis

Positive pleural effusion is stage 4

See Workup for more detail. See also Lung Cancer Staging -- Radiologic Options, a Critical Images slideshow, to help identify stages of the disease process.

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