To assess the expression of the IGF2BP3 protein in B-ALL, we employed a population-based pediatric cohort of 83 B-ALL cases, and immunostained the diagnostic bone marrow trephine biopsies embedded in a tissue microarray (TMA) with an antibody against IGF2BP3. The case summary for the TMA samples is shown in Table 1. This evidence concerns the gene IGF2BP3 and precursor B-cell acute lymphoblastic leukemia.