CARCINOEMBRYONIC ANTIGEN (CEA) LEVELS IN BLOOD SERUM AND GASTRIC JUICE IN BENIGN AND MALIGNANT GASTRIC LESIONS. - GÜLŞEN, Mustafa; GÜRBÜZ, A. Kemal; DAĞALP, Kemal; KARAEREN, Necmettin; BAĞCI, Sait; UYGURER, Can; ÖZGÜVEN, M. Ali; ALPER, A.; NARİN, Yavuz (Turkish Journal of Gastroenterology, 1994)