American Association for Cancer Research May 21 2026 Bottom line: A dual-threshold model for measuring the pancreatic tumor marker serum carbohydrate antigen 19-9 (CA19-9) identified patients with pancreatic cancer who had high-risk disease despite having low CA19-9 levels because of a genetic variation that impairs their ability to produce this biomarker. Journal in which the study was published: Clinical Cancer Research , a journal of the American Association for Cancer Research (AACR) Author: