<prompt> Prophylactic intracranial radiation is given inSmall cell carcinomaTesticular carcinomaBreast carcinomaGastric carcinoma  <response>: This aggressive form of lung cancer most commonly occurs in smokers. It usually starts in the breathing tubes bronchi and grows very quickly, creating large tumours and spreading metastasising throughout the body.Symptoms include bloody phlegm, cough, chest pain and shortness of breath.Treatment includes surgery for small tumours as well as chemotherapy, sometimes in combination with radiation therapy. 