CD40LG and B-cell chronic lymphocytic leukemia: For the CLL, c-CLL, and M-IGHV subsets, there was the presence of IgM mAbs against the hemolysin E protein of STY; while for p-CLL, CLL-TFT, and U-IGHV there was the presence of IgG mAbs against the outer membrane protein of STY.