SULF2 and Hyperbilirubinemia: When comparing the 435 patients with hyperbilirubinemia (grades 1-4) during induction/consolidation to the 215 patients with normal bilirubin levels, the five loci most associated with this phenotype were the UGT1A gene cluster, MARK2P5, SULF2, MIR924HG and USH2A (Suppl.