Excess body sugar helps cancer tumors hide from the immune system

Cancer tumors use excess body sugar not only as fuel but to build a physical barrier that shields them from the immune system. Researchers from the Sanford Burnham Prebys Institute found that high glucose levels prompt tumor cells to develop a dense layer of carbohydrate molecules known as the glycocalyx. This "armor" renders the tumor invisible to T-killer cells and reduces the effectiveness of modern therapies. The study identified the heat shock protein HSF1 as the molecular driver behind this mechanism. By isolating the role of HSF1, scientists have found a potential target for new drugs designed to "strip" cancer cells of their protection and restore the immune system's ability to attack the disease. The Biochemical Shield and Tumor Microenvironment While it was previously believed that reduced glucose oxidation in tumor zones resulted from internal defects in cancer cells, new evidence indicates that the process is dictated by the microenvironment—specifically connective tissue, blood vessels, and neighboring immune cells.