Single chain antibodies against the carcinoembryonic antigen (CEA), CD20, and CD38 tumor-associated antigens have all been expressed on recombinant MeV strains to facilitate targeted entry to epithelial carcinoma, non-Hodgkin’s lymphoma, and myeloma cells, respectively [103,104,105]. The gene discussed is CEACAM5; the disease is plasma cell myeloma.