Abstract:This study reports a case of IgG4-related autoimmune pancreatitis occurring in a chronic myeloid leukemia (CML) patient during flumatinib treatment. Currently, the incidence of tyrosine kinase inhibitor (TKI)-induced acute pancreatitis remains low (with more cases reported for nilotinib and imatinib, but only one documented case for flumatinib), and no cases of concurrent IgG4-related autoimmune pancreatitis have been reported. Furthermore, although the co-occurrence of hematological malignancies and IgG4-related diseases has been documented, the association between CML and IgG4-related disease remains unclear. This case provides valuable clinical insights into this potential correlation.