ARID5B and acute lymphoblastic leukemia: Also, a graduated scale of ALL risk was demonstrated for: i) increasing number of risk alleles at four of the loci combined (ARID5A, IKZF1, CEBPE and BMI1-PIP4K2A); and ii) an ARID5B risk allele with odds highest for children younger than five years and lowest for those older than 10 years.