<prompt> Most aggressive lung CA:Squamous cell CAAdenocarcinomaSmall cell lung CALarge cell CA  <response>: Ans. c Small cell lung CARef: Robbings 9th ed. 717 Small cell carcinoma is a highly malignant tumor with a strong relationship to cigarette smoking. Around 1 occurs in nonsmokers. They are the most aggressive of lung tumors, metastasizing widely and are always fatal. 