STING1 and neoplasm: The flavone-8-acetic acid derivative 5,6-dimethylxanthenone-4-acetic acid (DMXAA), a selective STING agonist of mice, has outstanding antitumor characteristics in multiple tumor models (Curran et al., 2016; Weiss et al., 2017; Liu et al., 2020; Xu et al., 2021).