resence of glycogen has beendescribed also in various cancer cells and tumours. The level ofglycogen accumulation varies greatly across tumours. The levels ofglycogen were demonstrated to be particularly high in breast,kidney, uterus, bladder, ovary, skin and brain cancer cell lines.Glycogen content in these cells and in human colorectal cancertissues was inversely correlated with proliferation rate, suggestingthat glycogen is consumed to sustain cancer cell growth [4,5]. Inparticular, ‘clear cell carcinomas’ represent a subset of tumours,which are characterised by a prominent cellular enrichment inglycogen. Their name derives from the clear, vacuolated appearanceof cellular cytoplasm caused by extraction of glycogen duringhistology processing