Indeed, KATO III tumor cells co-expressing HER2 and CEA were killed in the presence of either of the two αGC/sCD1d-antitumor proteins (Fig. 3b, left panel), with 40 and 60 % of tumor cells killed at an E/T ratio of 30/1 and 10 μg/ml of αGC/sCD1d-anti-HER2 and αGC/sCD1d-anti-CEA fusion proteins, respectively. Here, ERBB2 is linked to neoplasm.