Research Update: Vaccine Plus Checkpoint Inhibitor Combos for HPV-related Cancers
Source: MedPage Today Author: Mark L. Feurst Two new studies show the profound impact of a combined vaccine and anti-programmed death-1 (PD-1) antibody approach in the treatment of human papilloma virus (HPV)-related cancers. HPV causes nearly all cervical cancers, as well as most oropharyngeal, anal, penile, vulvar, and vaginal cancers. HPV16 and HPV18 are the leading viral genotypes that increase cancer risk. Given the viral cause of these cancers, immunotherapy has been considered a strong potential approach. Many patients with the HPV16 and HPV18 subtypes of head and neck squamous cell carcinoma have good outcomes from treatment that includes surgery or chemotherapy and radiation. Although anti-PD-1 therapy is approved for patients who do not respond to treatment or who develop metastatic disease, it benefits only about 15% of patients. The theory, therefore, is that a vaccine could potentially boost the immune systems of patients with HPV-related head and neck cancer, opening the door for better responses to other existing therapies. Vaccine + Nivolumab in Phase II Study In the first study, a phase II trial, a tumor-specific vaccine combined with the immune checkpoint inhibitor nivolumab was found to shrink tumors in patients with incurable HPV-related cancers. "Ours are the first results with this particular approach," Bonnie Glisson, MD, of the Department of Thoracic Head and Neck Medical Oncology at the University of Texas MD Anderson Cancer Center in Houston, told the Reading Room. "The rates of response and survival are approximately double what have been observed with nivolumab given alone [...]