Cancer cells love to reproduce, and need a lot of nutrition and energy to do so. They soak up so much glycogen that when CAT scans are given to look for them a glass of sugar water is often given just before the test because it will increase the metabolic rate and temperature of the cancer cells as they feed on the sugar and start reproducing.
Originally Posted by theaustinescorts
*SIGH*
#1, CT/CAT scans do not image based on metabolic activity nor thermal heat signatures. They are based on X-rays.
#2 For cancer, PET scans detect metabolic activity but need a radioactively labeled marker to detect it, typically using 2-deoxyglucose, an isomer of glucose which resists breakdown (glycolysis) and accumulates in cells, usually labeled with radioactive tritium in humans. Alternatively, fluordeoxyglucose can also be used; deoxyglucose labeled with the fluorine-18 isotope.
#3 Glycogen is a polymer starch of glucose. Cells do not burn glycogen directly, it must be converted to glucose first.
#4 CT/CAT scans or MRIs (with the appropriate contrast dyes to improve resolution) given to image or detect metastatic cancer are basically detecting inflammation, i.e., an accumulation of fluid in the afflicted area, though they can detect tumors if the tumors are large enough. However, sometimes the inflammation can be caused by other processes such as injury or infection.
#5 While cancer cells do love to reproduce, and are metabolically more active because of their high rate of division, they are also under constant oxidative stress because their blood supply is poorer than healthy tissues, due to the angiogenesis (growth of new blood vessels) that tumors stimulate being more chaotic and tortured and inefficient. This oxidative stress is part of the reason that they are more susceptible to the effects of chemotherapy than healthy tissue. But ironically, the poorer blood supply also limits their exposure to the chemotherapuetic agents.