Minibeam Radiation Therapy for Recurrent Mucosal Melanoma: An Eye-Opening Response

We report a case of novel radiation treatment referred to as minibeam radiation therapy (MBRT) that was used to treat recurrent mucosal melanoma. The patient’s disease recurred after surgery, conventional radiation therapy, and 4 lines of systemic therapy, and then, the patient was referred to our clinic. Despite substantial disease progression after multiple prior therapies, a complete metabolic and clinical response, along with an improved quality of life and performance status, was achieved after 2 treatments of MBRT. Additionally, disease response was noted in an unirradiated abdominal metastasis. The MBRT treatments were well-tolerated, with minimal toxicity reported more than 6 months posttreatment. This case highlights the potential of MBRT as a completely novel form of radiation therapy that warrants further study.