Lung cancer is an illness.
Cancer is a group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body . Lung . The tissue of the lungs can be affected by a number of diseases , including pneumonia and lung cancer . Lung cancer , also known as lung carcinoma , is a malignant lung tumor characterized by uncontrolled cell growth in tissues of the lung . Overall , 17.4 % of people in the United States diagnosed with lung cancer survive five years after the diagnosis , while outcomes on average are worse in the developing world .