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L-fucose (6.deoxy. L.galactose) is the only monosacharide which is placed in non reducting position of glycoproteins structure in L-deoxy form. L-fucosidase and fucosy 1 transferase directly take part in the elevation or decrease of sorum L-fucose levels. Tumors may directly induce enzymes that release L-fucose from glycoproteins formed in the neoplastic tissue, or the glycoproteins may be released indirectly as a result of body-defense metabolic secretion of glycoproteins and their filtration in glomeruls, and has a close correlation with glomerular filtration rate (GFR). In this study we compared urinary L-fucose of 30 known cases of cancer versus 40 healthy people. Fifteen patients had Gastrointestinal (GI) cancer and 15 patients Gyneclologic (Gyn) cancer. There was significant difference between urinary L-fucose of patients with GI cancer and controls (P<0.01), and also we saw the same result (P<0.01) in Gyn patients in comparison with controls. Significant elevations of urinary L-fucose, in GI and GY cancers may lead us in the way to further evaluation of its relationship with L-fucose levels to make its early diagnosis and better prognosis in susceptible individuals and those at a high risk of developing cancer, possible.