While both mesothelioma and non-small cell lung cancer (NSCLC) can present as serious respiratory illnesses, they have distinct origins. Mesothelioma is a rare disease that arises from the lining of the lungs' pleura. https://kiarartod746136.wikicorrespondence.com/5356205/mesothelioma_vs_non_small_cell_lung_cancer_understanding_the_difference