NCAM1 and squamous cell carcinoma: The 1, 2 and 3 degree with CD56+CD16+ NK cell infiltration were 24.3%, 32.4%, 43.2% in squamous cell carcinomas, and 62.2%, 16.2%, 21.6% in adenocarcinoma and 50.0%, 10.0%, 40.0% in large cell lung cancer, respectively.