I bet you didnt know that cancer cells feed on sugar in order for them to survive. This fact was part of the discovery of Dr. Otto Warburg about cancers biochemical cause way back in the 1930s. He pointed out several things that differentiate normal cells and cancer cells. Normal cells constantly need oxygen from blood circulation whereas cancer cells do not. It has been noted that any part of your body that do not contain any oxygen have cancer cells dwelling in it.