Although preclinical studies of genetically engineered interleukin-18 (IL-18) historically indicated its potential in cancer treatment, interest in the cytokine languished after GSK plc shelved its IL-18 therapeutic on lack of responses in a phase II melanoma trial. But in 2020, Yale University-based professor of immunobiology Aaron Ring set about reviving IL-18 as a cancer therapeutic. He went on to engineer a decoy-resistant form of IL-18 and then founded Simcha Therapeutics Inc. to develop the drug – named ST-067.