PO-516 E6/E7 RNA(LIP): a novel liposomal RNA vaccine for treatment of patients with HPV16-positive malignancies

Introduction Human papillomavirus (HPV) has emerged as a major risk factor for Head Neck squamous cell carcinoma (HNSCC) and the incidence of HPV-positive HNSCC continues to rise. Standard treatment of HNSCC given with curative intent causes substantial and long-term physical and functional impairments, but nonetheless, approx. 50% of patients die of their disease. Alternative treatments are urgently needed to improve survival but also to reduce treatment-associated morbidity. Both CD8+ and CD4+ T cells are important for viral clearance and regression of HPV-positive premalignant lesions; density of tumor-infiltrating lymphocytes (TILs) is a strong predictor of the outcome of HPV-positive o…