A few studies have found that non-O blood types (A, B, AB) may have a slightly higher risk of pancreatic cancer compared to type O.
But again:
The difference is statistically modest
Not enough to be used for diagnosis or prediction
Other risk factors are far more important
3. Colorectal Cancer
Some research suggests a possible mild association between blood type A and colorectal cancer risk. However, findings are inconsistent across populations.
4. No Strong Link for Most Cancers
For most cancers—including lung cancer, breast cancer, prostate cancer, and skin cancer—there is no reliable or consistent connection with blood type.
Why Blood Type Might Be Linked at All (Theories)
Scientists are still exploring why any connection exists at all. Several biological explanations have been proposed:
1. Immune System Differences
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