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.
A lung adenocarcinoma is a type of lung cancer that begins in the glandular cells of the lungs. These cells create and release fluids such as mucus. About 40 percent of all lung cancers are non-small cell adenocarcinomas. The two other main types of lung cancer are squamous cell carcinoma and large cell carcinoma. The majority of cancers that begin in the breast, pancreas, and prostate also are adenocarcinomas.