VDR and acute lymphoblastic leukemia: Our results indicate associations of polymorphic variants in three genes with the MRD-status in pediatric ALL patents: rs1544410 in VDR with MRD at day 15; rs1051266 in RFC, independently and in combination with rs10519613 in IL15 with MRD at day 33; and rs1051266 in RFC with MRD at week 12.