TP53 and diffuse large B-cell lymphoma: Overexpression of APOBEC3A did not induce the G/C-to-A/T mutation in TP53. Thus, APOBEC3B and not APOBEC3A may be responsible for the TP53 G/C-to-A/T mutation in DLBCL, although the molecular details remain to be elucidated.