SERUM SIALIC ACID AND ALKALINE PHOSPLATASE LEVELS AND THE IMPORTANCE IN THE DIAGNOSIS IN GASTROINTESTINAL CARCINOMA - CANORUÇ, Naime; CANORUÇ, Fikri; ÖZDEN, Turhan; ŞEN, Cihat; DEĞERTEKİN, Halil; GÖRAL, Vedat; AYYILDIZ, Orhan (Turkish Journal of Gastroenterology, 1993)