Hyperprogressive disease after radiotherapy combined with anti-PD-1 therapy in renal cell carcinoma: a case report and review of the literature.

backgroundStudies have shown that immune checkpoint inhibitors (ICIs) have limited efficacy and can even increase tumour burden in short time periods. This is usually called hyperprogressive disease (HPD). To date, there are few reports regarding HPD; fewer have analysed the relationship between HPD and radiotherapy combined with ICIs, and their conclusions are controversial. CASE PRESENTATION: A 42-year-old woman was diagnosed with stage IV renal clear cell carcinoma. The patient had previously received sorafenib and pazopanib as first- and second-line therapies, respectively. She received radiotherapy combined with nivolumab. Eighteen days after administration of the third dose of nivolumab, the patient's general condition deteriorated; this was associated with immune-related adverse events. Computed tomography showed that the diameter of left lung metastases had sharply increased. A biopsy of the lung metastasis showed no infiltration of lymphocytes. The patient's general condition worsened and she died of the disease on the 70th day after administration of the third dose of nivolumab.

conclusionsThis report describes the development of HPD following the administration of radiotherapy combined with ICIs in a case of advanced renal cell carcinoma. The case indicates that radiotherapy may show bidirectional regulation effects on anti-tumour immune response. If the immunosuppressive function of radiotherapy is dominant, combined with ICIs, it could result in HPD.