Ribon Therapeutics, founded by former member Paul Chang based on his work at the KI, has reported positive data from the dose-escalation portion of its Phase 1 trial of a small molecule PARP7 inhibitor. PARPs (poly ADP ribose polymerases) are enzymes that regulate essential cellular processes, including stress responses that enable cancer cells to survive and evade immune detection. In a trial of patients with various advanced solid tumors, Ribon’s candidate was well-tolerated, demonstrated target inhibition, and showed preliminary signs of antitumor activity, promising signs as the trial progresses to the next phase. Chang’s foundational research was supported in part by the Koch Institute Frontier Research Program via the Kathy and Curt Marble Cancer Research Fund.