CD40LG and skin basal cell carcinoma: In the presence of CD40L L cells, the percentage of cells undergoing apoptosis after exposure to the 5 cytotoxic agents was significantly reduced (-23% to -62%) in the 2 BCC lines as compared to a co-culture with L cells expressing CDw32 (CDw32 L cells) (not shown) or without CD40L L cells (Figure 1).