NUDT21 and cancer: NUDT21 has been found to be positively associated with multiple MMRs in most cancers, such as HNSC, KICH, KIRC, KIRP, LAML, LIHC, LUAD, LUSC, OV, PADD, PRAD, READ, ATAD, THCA, THYM, and UCEC (Figure 4A).