Serial number: 62720149 Name of institution: Hanoi Medical University New conclusions of the thesis: The study conducted on 81 patients with non-small cell lung cancer at stages II and IIIA has found that adenocarcinoma accounted for the highest rate (59.3%), followed by squamous cell carcinoma (23.5%), Large cell carcinomas (12.3%) and adeno-squamous carcinoma (4.9%).