A single dose of the hydrogel significantly suppressed tumor growth and extended survival relative to control groups: a soluble mixture of camptothecin and c‐di‐AMP, a hydrogel without camptothecin, and a hydrogel lacking c‐di‐AMP.[50b] These findings underscore the promise of combining STING agonists with camptothecin‐based chemotherapies to achieve durable antitumor immunity and improved therapeutic outcomes. This evidence concerns the gene STING1 and neoplasm.