NFKB1 and acute lymphoblastic leukemia: In this study, we measured the expression of miR‐204 and the methylation level of its promoter region in specimens from T‐ALL patients and in T‐ALL cell lines, and studied the effects of the downstream regulatory gene IRAK1 in changing the expression of NF‐κB and ultimately promoting proliferation and metastasis of T‐ALL cells.