Recent development on hyperthermia: An effective cotreatment improving radiotherapy outcome (Review)

Tumor hyperthermia, a treatment that employs various heating techniques to elevate the temperature of tumor lesions and induce tumor cell death, has been utilized in clinical practice for nearly four decades. As an adjunct to radiotherapy and chemotherapy, hyperthermia enhances the therapeutic efficacy against both primary and recurrent tumors. The present review explores the mechanisms underlying the synergy between radiotherapy and hyperthermia, while reviewing the outcomes of relevant clinical trials. The focus is on the molecular and biological basis for the roles of hyperthermia as a radiosensitizer, as demonstrated in vitro and in vivo experiments, and on optimizing its clinical application. Key mechanisms of action include inhibition of DNA repair, reduction of hypoxic tumor cell populations, enhancement of drug uptake and improved perfusion and oxygenation. Existing randomized, non-randomized and observational studies provide substantial evidence supporting the benefits of combining hyperthermia with radiotherapy.