TCF3 and acute lymphoblastic leukemia: Out of the total 166 B-ALL patients analyzed, 55 (33%) had BCR::ABL1, 5 (3%) had KMT2A::AFF1 (MLL::AF4), 4 (2%) had TCF3::PBX1 (E2A::PBX1), and none had ETV6::RUNX1 (TEL::AML1) fusion genes (Figure 1).