Expression of epidermal growth factor receptor gene in cultured human lung cancer cells

The expression and organization of epidermal growth factor (EGF) receptor gene in cultured human lung cancer cell lines (5 adenocarcinomas, 3 squamous cell carcinomas, 2 small cell carcinomas and 1 large cell carcinoma) have been studied. Two (PC-8 and PC-9) of the adenocarcinomas overproduced EGF receptor mRNA and protein, and exhibited gene amplification, the magnitude of which was comparable to that of A431 cells. Six cell lines (3 adenocarcinomas, 2 squamous cell carcinomas and 1 small cell carcinoma) expressed EGF receptor gene and its product to a significant level without gene amplification, and the other three cell lines were found to be negative as regards expression.