DNMT1 and B-cell chronic lymphocytic leukemia: This result differs from previous publications, which have compared CLL B cells with peripheral blood normal B cells to show, in one case, normal DNMT1 expression, an upregulation of DNMT3A, and a reduction of DNMT3B in CLL B cells [28], and in the other case, researchers have reported a reduction in DNMT1 [10].