NCT03169764 2025-02-24QUILT-3.047: NANT Head and Neck Squamous Cell Carcinoma (HNSCC) Vaccine: Combination Immunotherapy in Subjects With HNSCC Who Have Progressed on or After Chemotherapy and PD-1/PD-L1 TherapyImmunityBio, Inc.Phase 1/2 Withdrawn