Lung cancer stages
Small cell lung cancer staging
Small cell lung cancer stages are classified in one of two ways:
- Limited stage: Cancer is in one lung, sometimes including nearby lymph nodes.
- Extensive stage: Cancer has spread to the other lung, the fluid around the lung (the pleura) or to other organs in the body.
Non-small cell lung cancer staging
Non-small cell lung cancer staging uses the TNM system:
- Tumor(T) describes the size of the original tumor.
- Lymph node (N) indicates whether the cancer is present in the lymph nodes.
- Metastasis (M) refers to whether cancer has spread to other parts of the body, usually the liver, bones or brain.
A number (0-4) or the letter X is assigned to each factor. A higher number indicates increasing severity. For instance, a T1 score indicates a smaller tumor than a T2 score. The letter X means the information could not be assessed.
Once the T, N and M scores have been assigned, an overall stage is assigned.
Stages of non-small cell lung cancer: