Which Blood Group Has the Lowest Cancer Risk?
Large scientific reviews and cohort studies suggest that people with blood group O generally have a lower risk of developing certain cancers compared to non-O groups (A, B, and AB). One meta-analysis summarized the findings clearly: “Blood group A is associated with an increased risk of cancer, and blood group O is associated with a decreased risk.”
Patterns in Specific Cancers
The correlation appears most consistent with cancers affecting the digestive system:
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Stomach Cancer: Studies show that people with blood group A or AB face a higher risk of gastric cancer than those with blood group O.
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Pancreatic Cancer: The risk for pancreatic cancer tends to be greater among non-O blood types.
Findings can vary across different regions. For example, a study of Chinese men found that blood group B actually had a lower risk of gastrointestinal cancers than group A, highlighting how genetics and regional factors play a role.
The Statistical Breakdown
Overall, blood group O appears to offer the lowest relative cancer risk across many types, though the differences are often modest. One specific analysis estimated that individuals with blood group A had about a 19% higher risk of stomach cancer compared to those with group O.
