In line with the previously established correlation between SLAMF receptor expression on primary CLL cells and an indolent clinical course, we observed lower proliferation rates of the SLAMF receptor overexpressing sublines MEC-1LeGO-SLAMF1+ and MEC-1LeGO-SLAMF7+ as compared to the control cells MEC-1LeGO-empty (Fig. 2a, b). Here, SLAMF1 is linked to B-cell chronic lymphocytic leukemia.