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.
Small cell lung cancer accounts for 10%â15% of all lung cancers. It usually starts in the bronchi in the centre of the lungs. Small cell lung cancer is the most aggressive of all types of lung cancer.In many cases, it has spread to other parts of the body by the time it is diagnosed. Small cell lung cancer is also known as oat cell carcinoma or small cell undifferentiated carcinoma. Stage is the most important prognostic factor for small cell lung cancer. 2  Limited stage cancers have a much better prognosis than extensive stage cancers. 3  Most people with small cell lung cancer are diagnosed with extensive stage cancer because the cancer spreads early and quickly, before it causes symptoms.