Lung cancer is one of the most common cancers in the world. Lung cancer is the growth of cancerous cell that start off in one or both lungs. The cancer usually affects the cells that line the air passages. These cancerous cells divide into tumour which become larger and more numerous. Due to this the lung’s ability to provide the bloodstream with oxygen is lowered Lung cancer can be broadly classified into two main types based on the cancer cell appearance under a microscope: non - small cell lung cancer and small cell lung cancer.
Non-small cell lung cancer (NSCLC) accounts for 80% of lung cancers, while small cell lung cancer accounts for the remaining 20%.Small cell lung cancer (SCLC) is characterized by small cells that multiply quickly and form large tumours that travel throughout the body. Almost all cases of SCLC are due to smoking.