“…In line with published data, 9,10 we observed in our patient's peripheral blood an increase in the proportion of naive B cells and effector memory CD4 1 cells (Figure 2B-C). Although most studies 3,[11][12][13] emphasized inhibition of lymphocyte egress as the main mechanism responsible for the anti-GVHD effects of fingolimod, Taylor et al reported contrasting effects of the drug in a murine model of acute GVHD. 14 In this study, fingolimod did not uniformly trap effector T cells in all secondary lymphoid organs.…”