RUNX1 and acute lymphoblastic leukemia: Where previously DMCs associated with day care attendance were not observed to have any overlap with constitutional methylation across all subtypes (Table 1), significant overlaps were observed for T‐ALL (p = 0.048), KMT2A‐r (MLL) (p = 0.006), dic(9::20) (p = 0.037), ETV6::RUNX1 (p = 0.022), undefined (p = 0.013) and non‐recurrent (p = 0.016) subtypes (Table 3).