Researchers at Sanford Burnham Prebys Medical Discovery Institute and collaborating institutions have identified environmental conditions that enable cancer cells to develop a dense, sugar-derived coating known as the glycocalyx, which acts as a form of camouflage to evade immune system detection. Their study, published in Science Advances on August 7, 2026, reveals that changes within the tumor microenvironment, including mechanical forces and nutrient availability, influence the effectiveness of this protective layer. The researchers found that hyperglycemia—excess glucose—increases the thickness of the glycocalyx, but only under conditions that closely mimic the human body’s physiological environment.
The study further elucidates the role of heat shock factor 1 (HSF1), a protein associated with cellular stress responses and previously linked to breast cancer progression. The presence of HSF1, combined with hyperglycemia and tumor microenvironment-like conditions, enhances cancer cells’ ability to escape immune surveillance. The researchers propose that targeting HSF1 with drugs could potentially reduce the glycocalyx’s thickness, thereby exposing cancer cells to immune attack and improving the efficacy of immunotherapy. This finding may be particularly relevant given the rising prevalence of metabolic syndrome and type 2 diabetes, conditions often characterized by hyperglycemia, which have been associated with increased cancer risk and poorer treatment outcomes. Source