Researchers reviewed 28 previous studies from countries including Denmark, Sweden, the United Kingdom, the United States, and Australia.
They examined individuals who had been diagnosed with an allergic disease before they potentially developed cancer.
The aim was to determine whether allergies influence the risk of cancer.
Previous research has produced conflicting findings, prompting the researchers to provide a comprehensive overview, according to News-Medical.
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Major differences
The study, published in Scientific Reports, found that the results varied depending on both the type of cancer and the geographical region.
A statistically significant association was identified for several cancers, including lung cancer, blood cancers, kidney cancer, testicular cancer, and thyroid cancer.
For colorectal cancer and uterine cancer, the association was reversed.
At the same time, the researchers found no reliable association for several other types of cancer.
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According to the study, this means that no single overall conclusion can be drawn for all cancer types.
A slightly increased risk
The researchers also found that the association was statistically significant only in countries within the Western Pacific region.
The same association was not observed in Europe or the Americas.
Asthma was also the only allergic disease that, on its own, showed a statistically significant association with cancer.
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People with allergies had a small but statistically significant higher risk of developing cancer.
However, the researchers emphasize that the increased risk is limited and that the findings should not lead to changes in current treatment.
Instead, the study highlights the need for further research.
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