Turnstone Biologics
Biotechnology ResearchCalifornia, United States11-50 Employees
Turnstone Biologics is a clinical-stage biotechnology company based in San Diego, California, focused on developing therapies for solid tumors. Its approach relies on Selected Tumor-Infiltrating Lymphocytes, which are identified, selected, and expanded to form potent tumor-reactive T cells, with the aim of addressing limitations seen with earlier bulk TIL therapies. The company’s clinical program, TIDAL-01, has been evaluated in early-phase studies across colorectal cancer, head and neck cancer, and uveal melanoma. Turnstone operates within the biotechnology research sector and pursues a next-generation TIL platform as its primary clinical strategy. In August 2025, XOMA Corporation merged Turnstone Biologics into a subsidiary of XRA 3 Corp., marking a significant corporate development for the company.