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.
Background. Lung cancers are generally divided into two main categories: small cell lung cancer (SCLC) and nonâsmall cell lung cancer (NSCLC). NSCLC accounts for approximately 85% of all lung cancers. Histologically, NSCLC is divided further into adenocarcinoma, squamous cell carcinoma (SCC), and large cell carcinoma.