In order to find the cause for the discrepancy between our results and those of Ronchi et al., we performed additional Western blot analyses using three different antibodies towards human CYP2W1 and samples encompassing negative controls, positive controls with recombinantly expressed CYP2W1, normal tissue from adrenal glands, a colon tumor as well as a blot containing proteins from 9 different human tissues (S1–S3 Figs). This evidence concerns the gene CYP2W1 and colonic neoplasm.