Overview of ongoing clinical trials investigating combined radiotherapy and immunotherapy.

Given the unprecedentedly rapid progression of clinical immuno-oncology, evaluation of currently ongoing and upcoming clinical trials is essential to address potential deficiencies for future trial design. This observational study examined trends in the current landscape of clinical trials investigating immunotherapy with radiotherapy (iRT). The National Institute of Health's clinicaltrials.gov database was queried for trials including radiation and one of the six currently US FDA approved immunotherapy drugs: ipilimumab, nivolumab, pembrolizumab, durvalumab, atezolizumab and avelumab. This study highlights that the construction of prospective iRT trials is rapidly escalating. This study provides a framework to not only understand ongoing multidisciplinary trials, but also for prudent iRT trial design in the future.