BTG1 microdeletion occurrence within cytogenetic subgroups of ALL.

BTG1 deletion status was determined using MLPA.aBecause of missing values, numbers do not always add up to 722 BCP-ALL cases. Data was available for 637 cases on hyperdiploidy; 513 cases for ETV6-RUNX1; 648 cases for BCR-ABL1; 649 cases for MLL-rearranged.bThe ‘other’ subgroup encompasses cases negative for ETV6-RUNX1 or BCR-ABL1 translocations, MLL-rearrangement and/or hyperdiploidy. This group includes 10 cases with E2A-PBX1 translocation, of which none harbor a BTG1 deletion.cSubgroup unknown includes all cases in which no data is available in one or more cytogenetic classifications.dFisher's exact test was used when sample groups were small.