IS A STUDY OF THE LEVEL OF CARBOHYDRATE ANTIGEN (CA 19-9) EFFECTIVE IN PATIENTS WITH COLORECTAL CANCER? Вопр. онкол. [Internet]. 2020 May 1 [cited 2026 Oct. 14];66(5):528-34. Available from: https://voprosyonkologii.ru/index.php/journal/article/view/1140