AFF4（AF4/FMR2 family member 4），癌症关联基因，基因ID：27125，该基因编码的蛋白属于白血病相关转录因子AF4家族它是正转录延长因子b（p-tefb）复合物的组成部分。在患有ins（5；11）（q31；q31q23）的婴儿急性淋巴细胞白血病中发现了一个染色体易位，涉及该基因和11号染色体上的mll基因。[由RefSeq提供，2011年10月]The protein encoded by this gene belongs to the AF4 family of transcription factors involved in leukemia. It is a component of the positive transcription elongation factor b (P-TEFb) complex. A chromosomal translocation involving this gene and MLL gene on chromosome 11 is found in infant acute lymphoblastic leukemia with ins(5;11)(q31;q31q23). [provided by RefSeq， Oct 2011]。