<prompt> Most common type of lung carcinoma in non smokers is: March 2005 and September 2011Small cell carcinomaAdenocarcinomaSquamous cell carcinomaLarge cell carcinoma  <response>: Ans. B: AdenocarcinomaCommon types of lung cancer classification e.g., based on histopathologic factors include the following:Small cell carcinoma also called oat cell carcinoma; lung cancer composed of anaplastic unspecialized, undifferentiated small cellsSquamous cell carcinoma cancer of the layered, squamous epithelium surface cells of the lungs or bronchiAdenocarcinoma cancer of the glandular tissue, or cancer in which the tumor cells form recognizable glandular patternsLarge cell carcinoma lung cancer composed of large-sized cells that are anaplastic in nature and often arise in the bronchiBroncho-alveolar carcinomaMixed and undifferentiated pulmonary carcinomasAdenocarcinoma of the lung is currently the most common type of lung cancer in lifelong non-smokers. Adenocarcinomas account for approximately 40 of lung cancers.This cancer is more often seen peripherally in the lungs than are small cell lung cancer and squamous cell lung cancer, both of which tend to be more often centrally located. 