High blood sugar may help cancer cells hide from the immune system

Researchers discovered a possible way cancer cells hide from the immune system: they build a thick, sugar-rich coating around themselves. High blood sugar can strengthen this protective shield under conditions that resemble the environment inside tumors, with the protein HSF1 playing a key role. Blocking this process could make cancer cells easier for the immune system to recognize and destroy.

Cancer cells can sometimes evade the immune system by surrounding themselves with a dense layer of sugar-derived molecules. This coating can act as a form of camouflage, making it harder for immune cells to recognize and destroy them.

Researchers at Sanford Burnham Prebys Medical Discovery Institute and collaborating institutions across North America have now identified environmental conditions that can help cancer cells build this protective layer. Their findings, published August 7, 2026, in Science Advances, suggest that changes within the tumor microenvironment, the surrounding mixture of immune cells, connective tissue, blood vessels, proteins and carbohydrates, can influence how effectively cancer cells conceal themselves.

The researchers also identified a potential way to reduce this sugar-rich coating, potentially making cancer cells easier for the immune system to detect and eliminate.

https://www.sciencedaily.com/releases/2026/08/260829235950.htm