Excess body sugar helps cancer tumors hide from the immune systemCancer tumors use excess body sugar not only as fuel but to build a physical barrier that shields them from the immune system. This layer becomes sufficiently powerful to physically block antibodies and immune cells from reaching receptors on the surface of the tumor. The Role of Protein HSF1The heat shock protein HSF1 acts as the coordinator for the construction of the "sugar shield." Without this protein, cancer cells remain vulnerable regardless of surrounding sugar levels. Excess sugar is processed by cancer cells into complex carbohydrate chains that form a thick "crust" on the cell surface, physically blocking immune cells from accessing the tumor.