The mRNA and protein expression levels of FAM83A and KRT6A in tumor cells A549, PC9, and H1975 were higher than those of normal cells BSE-2B, while the mRNA and protein expression level of CYP4B1 in normal cells BSE-2B was higher than that of tumor cells H1299, PC9, A549 and H1975 (Fig. 9A–E) (*p < 0.05, **p < 0.01, ***p  < 0.001). The gene discussed is CYP4B1; the disease is neoplasm.