Interestingly, NUDT4, NUDT5, NUDT6, NUDT7, NUDT8, and NUDT9 were assigned to the same cluster when considering data from the three cancer cell lines together (Fig. 8e, f); however, when examining data collections limited to A549 (Fig. 8g, h) or MCF7 (Fig. 8i, j), these enzymes were assigned to two or three separate clusters, respectively. This evidence concerns the gene NUDT5 and cancer.