Using the different CD20 variant profiles in the different B cell lines, Raji, Mec, Rec, and SKW6.1 (Fig. 3c), derived from different hematologic diseases (respectively, CLL, Burkitt lymphoma, MCL, B lymphoblastoid), we investigated the RT-qCPR expression of the different CD20 variant transcripts in different B cell malignancies. This evidence concerns the gene MS4A1 and mantle cell lymphoma.