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Research suggests that blood type may have some association with cancer risk, though the effect is modest and varies across studies.

Large analyses, including systematic reviews and cohort studies, have found that individuals with blood group O tend to have a slightly lower risk of certain cancers compared to those with types A, B, or AB.

For instance, blood group A has been linked to a higher overall cancer risk, while group O is often associated with a reduced risk in comparison.

Looking at specific cancers, stomach (gastric) cancer appears more common in people with blood types A and AB than in those with type O.

Similarly, some studies indicate that pancreatic cancer risk is higher among individuals with non-O blood types (A, B, and AB).

However, findings are not always consistent. In some populations, blood type B has been associated with lower risks for certain cancers compared to type A, highlighting variability across studies.

Overall, blood group O is generally linked to the lowest cancer risk, but the differences are small, not causal, and far less important than lifestyle factors, genetics, and regular health screening.