HOXA9 and B-cell acute lymphoblastic leukemia: Other rearrangement partners of HOXA9 have been reported in lymphoid malignancies, such as TRB in T cell acute lymphoblastic leukemia (T-ALL) patients (21) and MED12 in a pediatric patient with B cell acute lymphoblastic leukemia (B-ALL) (22) (Supplementary Table 6).