“The two major types of lung cancer are small cell lung cancer (SCLC) and non-small cell lung cancer (NSCLC).

SCLC accounts for about 13 percentTrusted Source of all lung cancers. It’s less common than NSCLC, according to the American Cancer Society (ACS).

However, SCLC is the more aggressive form of lung cancer. With SCLC, the cancer cells tend to grow quickly and travel to other parts of the body, or metastasize, more easily.

Though the majority of lung cancer cases are non-small cell lung cancer (NSCLC). Doctors stage NSCLC according to how far it has progressed. Stages range from occult (or hidden) cancer to stage 4 cancer, in which multiple organs may be affected.

The staging system helps doctors determine the best treatment plan, and helps individuals with cancer and their families understand the severity of the disease and the outlook.

There are several different staging systems used around the world, but the most widely used approach is known as the TNM system.”

healthline (https://www.healthline.com/health/lung-cancer-small-cell)