CD40LG and non-Hodgkin lymphoma: The inhibition of caspase-3-like and 8-like activities, but not caspase-9-like activity, by permeable tetrapeptide inhibitors also blocked the apoptosis induced by doxorubicin in NHL cell lines, suggesting that the downregulation of caspase-3-like is an essential molecular mechanism of the protective effect of CD40L.