ERBB2 and neoplasm: In contrast, the SKBR-3 tumor cells expressing only HER2 were exclusively killed when incubated with the αGC/sCD1d-anti-HER2 protein (Fig. 3b, right panel), with 80 % of cells eliminated, while co-incubation with the αGC/sCD1d-anti-CEA protein resulted in only background 51Cr release similar to medium alone.