For example, programmed cell death 1 ligand 1 (PD-L1) expression in tumor cells could be stimulated by STING agonist in a cancer murine model [7], by elevated STING expression in DNA damage-response-deficient breast cancer cells [8] and by radiation-therapy-induced STING expression in human and mouse liver cancer cells [9]. Here, STING1 is linked to cancer.