CEACAM5 and cancer: Immunotherapeutic strategies include immune checkpoint inhibitors, cancer vaccines, adoptive cell transfer, oncolytic viral therapy, and carcinoembryonic antigen (CEA) T-cell bispecific antibodies, which focus on selectively enhancing the host immune system to fight cancer (Kakimi et al., 2017; Szeto and Finley 2019; Wrobel and Ahmed 2019).