A number of other promoters were assessed in vitro and in vivo to optimize the delivery efficiency of suicide genes, suggesting that some of them—namely, carcinoembryonic antigen (CEA) [55,56], epithelial cell adhesion molecule (EpCAM) [57], human telomerase reverse transcriptase (hTERT) [58]—might as well be suitably included in AAVP for cancer targeting. The gene discussed is CEACAM5; the disease is cancer.