Boosting Cancer Immunotherapy with Hyperthermia

The current wave of innovation in immunotherapy has fundamentally changed cancer treatment. These innovative therapies specifically activate the body's own immune system to fight malignant tumors – and open up new treatment options, especially where classic methods such as chemotherapy or radiation therapy reach their limits.

Despite recent advances in the diagnosis and treatment of cancer, this disease remains one of the greatest health threats to humanity.

Medical hyperthermia (HT) is a particularly promising addition to immunotherapy. It involves the controlled heating of tumor tissue to enhance the effect of other cancer treatments. Numerous scientific studies show that hyperthermia can significantly increase the effectiveness of radiation therapy, chemotherapy, and immunotherapy.

How hyperthermia activates the immune system

Hyperthermia acts on several levels of the immune system. It stimulates both the innate and adaptive immune systems, thereby supporting the body's natural defenses against cancer cells.

The most important effects include:

•    Activation of immune cells such as neutrophils, natural killer cells (NK cells), and dendritic cells

•    Modulation of the tumor microenvironment (TME), reducing immune-inhibiting conditions

•    Promotion of immunogenic cell death (ICD), which specifically alerts the immune system to tumor cells

These mechanisms can transform so-called “cold tumors,” which normally respond poorly to immunotherapies, into immunologically active tumors. This increases the likelihood that the

immune system will effectively recognize and destroy cancer cells.

Improved effect of immune checkpoint inhibitors

Another significant advantage of hyperthermia is its ability to increase the effectiveness of immune checkpoint inhibitors (ICIs). These therapy release the immune system's brake mechanisms, allowing defense cells to better attack tumors.

Hyperthermia supports this process by:

•    Improving the infiltration of immune cells into tumor tissue

•    triggering the release of DAMPs (damage-associated molecular patterns)

•    optimizing antigen presentation, thereby strengthening immune recognition

Both preclinical studies and clinical trials show that the combination of hyperthermia and immunotherapy can lead to improved treatment outcomes for certain types of tumors—even those that were previously considered resistant to therapy.

Current state of research and future prospects

Despite the promising results, the full therapeutic potential of hyperthermia has not yet been fully exploited. Further scientific studies are necessary to:

•    define optimal treatment protocols

•    better understand the differences between local hyperthermia and whole-body hyperthermia

•    identify biomarkers for patient selection

However, current research already clearly shows that hyperthermia can play a decisive role in modern cancer immunotherapy and has the potential to significantly improve the effectiveness of innovative treatment strategies.

These findings underscore the growing importance of hyperthermia as an integral part of modern oncological therapy concepts.