MBP and Low back pain: Among the children diagnosed with CML-BP, 71.4% were classified as chronic myeloid leukemia lymphoid blast phase(CML-LBP), 25.0% belonged to the chronic myeloid leukemia myeloid blast phase(CML-MBP), and 3.6% belonged to the chronic myeloid leukemia mixed phenotype acute leukemia(CML-MPAL).