ABCB1 and cancer: In this study, by comparing the frequency of genotypes and alleles occurrence of a given polymorphism between the group of patients with non-small cell lung cancer and the control group, it was shown that the TT genotype and allele T of the ABCB1 gene C3435T were significantly more frequent in the group of cancer patients (p = 0.0124; p = 0.0041, respectively).