STING1 and cancer: The delivery of adjuvants such as 3-O-desacyl-4′-monophosphoryl lipid A (MPLA), lipopolysaccharide (LPS), CpG oligodeoxynucleotides (ODNs), polyinosinic:polycytidylic acid (poly I:C), and agonists of the stimulator of IFN genes (STING) have also been used to increase immunogenicity and promote the anti-cancer immune responses [44].