The clinical data of 340 patients with LPL admitted to the Institute of Hematology & Blood Diseases Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College were collected retrospectively, including 23 cases of the non-IgM LPL and 317 cases of the Waldenström's macroglobulinemia(WM), from July 1993 to August 2020. This evidence concerns the gene CD40LG and Waldenstrom macroglobulinemia.