DNMT1 and cervical squamous cell carcinoma: Moreover, there was a positive correlation between P4HA1 expression and the expression of four methyltransferases (DNMT1, DNMT2, DNMT3A, and DNMT3B) in many tumor types, including ACC, CESC, chromophobe RCC, papillary RCC, LGG, PRAD, READ, SKCM, TGCT, THCA, UCEC, and UVM.