Non-small cell lung cancer patients with the UGT1A9 rs3832043 T9/T9 genotype, which resulted in the deletion of the thymine nucleotide in the −118 promotor sequence of the UGT1A9 gene, had decreased gene expression and hence reduced glucuronidation capacity of UGT1A9. This evidence concerns the gene UGT1A9 and non-small cell lung carcinoma.