NCT05681039 2026-06-02Phase 2 Trial of Neoadjuvant and Adjuvant Tiragolumab Plus Atezolizumab in Patients With Newly Diagnosed PD-L1 CPS Positive Resectable Stage 3-4 Oral Cavity Squamous Cell Carcinoma (OCSCC).M.D. Anderson Cancer CenterPhase 2 Active not recruiting29 enrolled