CD40LG and B-cell chronic lymphocytic leukemia: Next, 29 B-CLL cells (10 CE−/IgM-, 4 CE+/IgM+, 4 CE+/IgM- and 11 CE+/IgM+) were selected and a correlation matrix was performed for all in order to compare CE with (i) the basal intracellular Ca2+ level estimated by the initial F340/380 ratio, (ii) the anti-IgM Ca2+ response; (iii) the ER Ca2+ release by thapsigargin (TG), an inhibitor of the ER Ca2+ ATPase pumps, that artificially and maximally deplete Ca2+ stores in the absence of extracellular Ca2+; and (iv) the TG SOCE response observed after Ca2+ reffiling.