Xilio Therapeutics, Inc. has announced new data from its pipeline of tumor-activated immuno-oncology therapies at the Society for Immunotherapy of Cancer $(SITC)$ 40th Annual Meeting, held from November 5-9, 2025. The company presented preclinical data on its masked T cell engager platform, as well as clinical data from its ongoing studies. Phase 1 data for efarindodekin alfa, a tumor-activated IL-12, and Phase 2 data related to circulating tumor DNA (ctDNA) for vilastobart, a tumor-activated, Fc-enhanced anti-CTLA-4, were showcased during the event. Xilio also announced development milestones for its masked T cell engager programs, with plans to advance at least two candidates into IND-enabling studies and submit IND applications in 2027. Copies of the presentations are available on the Xilio Therapeutics website.