IKZF1 and acute lymphoblastic leukemia: When comparing the ALL cases by age strata (infants versus children aged between 13 and 24 months), white children with ALL of both age groups presented with an increased risk for MLL-germline leukemia associated with the heterozygous/mutant genotypes IKZF1 (OR 5.57, 95% CI: 1.39-22.24 and OR 2.58, 95% CI: 1.02-6.51, respectively).