TCL1A and B-cell non-Hodgkin lymphoma: In splenic marginal zone B-cell lymphomas, this latter correlation has never been directly proven, but indirect evidence comes from studies that demonstrated that the presence of wild-type IGHV genes correlates with the presence of deletion of 7q31 [26] and that such a deletion correlates in turn with the expression of TCL1A in SMZL [17].