OBJECTIVES: A risk association has been observed between non-O blood groups and pancreatic adenocarcinoma. Chronic pancreatitis also increases risk for pancreatic cancer, raising questions as to whether non-O blood groups are a risk for chronic pancreatitis and whether the pathophysiologic pathways are linked. Our goal was to determine whether ABO blood group may affect the risk of chronic pancreatitis. METHODS: The study cohort included chronic pancreatitis patients (n = 499) and healthy controls (n = 631) from the North American Pancreatitis Study 2 study. Genotyping was performed using Sequenom assay of rs8176746 A/C and rs505922 C/T to classify participants into ABO blood groups. RESULTS: O blood group was nonsignificantly more common among cases (44.7% vs 42.0%; P = 0.36), particularly among cases with alcohol-related chronic pancreatitis (49.3% vs 42%; P = 0.060). Alcoholic patients without coexisting high-risk PRSS1, CFTR, or SPINK1 variants had a significant overrepresentation of O blood type when compared with controls (odds ratio, 1.54; 95% confidence interval, 1.09-2.17; P = 0.01). CONCLUSIONS: A, B, and AB blood groups were not associated with a greater likelihood of having chronic pancreatitis and may decrease the risk of chronic pancreatitis in individuals who are very heavy drinkers. These results suggest that the mechanism linking non-O blood type with pancreatic pathology is specific to carcinogenesis.
OBJECTIVES: A risk association has been observed between non-O blood groups and pancreatic adenocarcinoma. Chronic pancreatitis also increases risk for pancreatic cancer, raising questions as to whether non-O blood groups are a risk for chronic pancreatitis and whether the pathophysiologic pathways are linked. Our goal was to determine whether ABO blood group may affect the risk of chronic pancreatitis. METHODS: The study cohort included chronic pancreatitispatients (n = 499) and healthy controls (n = 631) from the North American Pancreatitis Study 2 study. Genotyping was performed using Sequenom assay of rs8176746 A/C and rs505922 C/T to classify participants into ABO blood groups. RESULTS: O blood group was nonsignificantly more common among cases (44.7% vs 42.0%; P = 0.36), particularly among cases with alcohol-related chronic pancreatitis (49.3% vs 42%; P = 0.060). Alcoholic patients without coexisting high-risk PRSS1, CFTR, or SPINK1 variants had a significant overrepresentation of O blood type when compared with controls (odds ratio, 1.54; 95% confidence interval, 1.09-2.17; P = 0.01). CONCLUSIONS: A, B, and AB blood groups were not associated with a greater likelihood of having chronic pancreatitis and may decrease the risk of chronic pancreatitis in individuals who are very heavy drinkers. These results suggest that the mechanism linking non-O blood type with pancreatic pathology is specific to carcinogenesis.
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