CEACAM5 and pancreatic adenocarcinoma: Consequently, the results presented in this study have led us to explore the effects of PDT employing tumors expressing clinically relevant tumor antigens like P815 mastocytoma expressing murine homologue of cancer testis antigen P1A[63] or pancreatic adenocarcinoma Panc02 expressing human carcinoembryonic antigen [64].