Interior of the cecum and lower end of ascending colon with the ileocecal valve labeled as colic valve. Endoscopic image of cecum with arrow pointing to ileocecal valve in foreground.
Lung cancer is a malignant tumour that starts in the cells of the lung. Malignant means that it can spread, or metastasize, to other parts of the body. When cancer starts in lung cells, it is called primary lung cancer. The lung is part of the respiratory system. You use your lungs when you breathe.
NSCLC is the most common type of lung cancer. About 85% of lung cancers are NSCLC. In people with NSCLC, the cancer may spread from the lungs to other parts of the body. This is called advanced NSCLC. This type of cancer is also known as metastatic (met-tuh-STA-tik) or stage 4 lung cancer. Most common places in the body where advanced NSCLC may spread.