The average age in years at diagnosis was 0.65 ± 0.68 for MLL rearranged BCP-ALL and 4.85 ± 2.95 for TEL-AML1-positive BCP-ALL, while the non-fetal origin group aged 6.39 ± 4.18. The gene discussed is RUNX1; the disease is acute lymphoblastic leukemia.