Study supports immunotherapy/radiation combo in head and neck cancer
Source: www.onclive.com Author: Laura Panjwani There may be potential synergy between radiation therapy, given with or without chemotherapy, and immune checkpoint inhibitors in patients with squamous cell carcinoma of the head and neck (SCCHN), according to results of a prospective study. The study, which was presented at the the 2016 Multidisciplinary Head and Neck Cancer Symposium in February 2016, examined blood samples from 16 consecutive patients with SCCHN undergoing curative-intent radiation therapies. Samples were obtained at week 1 and week 6 to 7. Patients received a median of 70 Gy for disease in the oropharynx (n = 12, 75%), nasopharynx (n = 2, 12%), larynx (n = 1, 6%), or oral cavity (n = 1, 6%). The majority of patients had stage IV disease that was metastatic to regional lymph nodes and received concurrent platinum-based chemotherapy. The analysis found that, during radiation treatment, circulating CD8-positive T-effector cells increased (P = .01), as did CD4-positive PD-1–positive cells (P = .02), CD8-positive LAG3-positive cells (P = .02), and regulatory T cells (P = .04). sPD-L1 levels also increased, mirroring increases in CD8-positive T cells over the course of therapy (P = .047). While the extent to which these systemic changes reflect changes in the tumor microenvironment is unknown, the study authors noted that these findings support the “complex immunologic effects of fractionated chemoradiation therapy and mechanisms for potential synergy between chemotherapy, radiation treatment, and immunotherapy in SCCHN.” To learn more about the impact of the research, OncLive spoke to one of the [...]