Come on goly,your slacking
The dye used in PET scans for cancer contains sugar, typically in the form of a molecule called fluorodeoxyglucose (FDG), because cancer cells tend to use much more glucose (sugar) than normal cells, so when injected with a radioactive form of sugar, the cancer cells will absorb more of it, making them easily identifiable on the scan; essentially, the sugar acts as a marker to highlight where the cancerous tissue is located in the body.