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Inherited EGFR T790M Is Linked to a 62-Fold Higher Lung Cancer Risk in Never-Smokers
In a study of more than 3.3 million people of European ancestry, inherited EGFR T790M was associated with about 25 fold higher lung cancer risk overall and a 62 fold higher risk among never smokers. Researchers identified 641 carriers among more than 10 million consented 23andMe research participants; the variant wa...
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Research answer
Key takeaways
- In a study of more than 3.3 million people of European ancestry, inherited EGFR T790M was associated with about 25 fold higher lung cancer risk overall and a 62 fold higher risk among never smokers.
- Researchers identified 641 carriers among more than 10 million consented 23andMe research participants; the variant was estimated at roughly 1 in 15,850 people in the analyzed dataset.
- The association was reported for lung cancer, not the 17 other cancers and non pulmonary conditions examined, and carriers developed lung cancer about five years earlier on average.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did a Science study by researchers at Dana-Farber Cancer Institute and the 23andMe Research Institute find about the inherited EGFR T79. Article summary: The study found that inherited EGFR T790M is an unusually strong, lung-cancer-specific risk variant: carriers had about 25-fold higher overall odds of lung cancer, and never-smoker carriers had an estimated 62-fold highe. Topic tags: general, government, news, general web, academic. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, ch
A rare inherited variant in the EGFR gene, called T790M, was associated with a markedly higher likelihood of lung cancer in a large study led by Dana-Farber Cancer Institute and the 23andMe Research Institute. The association was strongest among people who had never smoked: carriers had an estimated 62-fold higher risk than never-smokers without the variant. 5
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What the study found
The researchers analyzed genetic and health data from more than 3.3 million 23andMe research-consented participants of European ancestry to estimate the relationship between inherited EGFR T790M and lung cancer. Carrying the variant was associated with about a 25-fold higher risk of lung cancer overall. 6
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Among never-smokers, the estimated association was substantially larger: about 62-fold higher than in never-smokers without the variant. Reports of the study put the corresponding estimate among smokers at roughly tenfold. 2
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The variant is rare. Across more than 10 million consented 23andMe research participants, researchers identified 641 carriers; one report of the analysis estimated a prevalence of approximately 1 in 15,850. 4
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The signal appeared specific to lung cancer
The study’s result was not a broad association across cancer types. Of the 17 cancers and non-pulmonary conditions screened, the strong association was reported only for lung cancer. People with the variant who developed lung cancer did so about five years earlier on average than noncarriers, according to coverage of the findings. 9
That specificity matters: it suggests the variant may identify a distinct inherited susceptibility to lung cancer rather than simply reflecting a generalized predisposition to cancer.
Why the variant is concentrated in Southern Appalachia
Genetic and geographic analyses traced the variant’s U.S. distribution to a founder effect. It likely arrived with British and Irish settlers in the early 1700s and became more common through demographic isolation associated with a Southern Appalachian genetic bottleneck. The variant is concentrated among people with roots in Alabama, Mississippi, and Tennessee. 2
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A founder effect describes a situation in which a variant carried by a relatively small ancestral group becomes more frequent in later generations than it would be in a larger, more genetically diverse population.
What this could mean for lung cancer screening
Current lung cancer screening programs generally prioritize age and smoking history. The new findings raise an important research question: whether people with confirmed inherited EGFR T790M should receive surveillance even if they have never smoked, and perhaps at younger ages than conventional eligibility rules allow.
That is not the same as an established screening recommendation. The study identifies a powerful association, but it does not determine the best age to begin CT screening, how often scans should occur, or whether the benefits outweigh potential harms for unaffected carriers.
The ongoing INHERIT study (NCT05587439) is enrolling people and families with known or suspected inherited susceptibility to lung cancer, including those carrying or at risk of carrying germline EGFR variants. Its goal is to improve understanding of inherited lung-cancer risk, particularly in families with little tobacco exposure. 1
The practical takeaway
Inherited EGFR T790M appears to be one of the strongest known inherited risk factors for lung cancer, particularly among never-smokers. But it remains rare, and the evidence should not be interpreted as a population-wide case for genetic testing or CT screening.
For someone with a known family history of this variant or an identified germline EGFR T790M result, the study provides a strong rationale to discuss genetic counseling and individualized follow-up with a clinician experienced in hereditary cancer risk. Decisions about testing and surveillance should be made with that specialist, because evidence-based screening protocols for unaffected carriers are still being developed. 1
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What is the short answer to "Inherited EGFR T790M Is Linked to a 62-Fold Higher Lung Cancer Risk in Never-Smokers"?
In a study of more than 3.3 million people of European ancestry, inherited EGFR T790M was associated with about 25 fold higher lung cancer risk overall and a 62 fold higher risk among never smokers.
What are the key points to validate first?
In a study of more than 3.3 million people of European ancestry, inherited EGFR T790M was associated with about 25 fold higher lung cancer risk overall and a 62 fold higher risk among never smokers. Researchers identified 641 carriers among more than 10 million consented 23andMe research participants; the variant was estimated at roughly 1 in 15,850 people in the analyzed dataset.
What should I do next in practice?
The association was reported for lung cancer, not the 17 other cancers and non pulmonary conditions examined, and carriers developed lung cancer about five years earlier on average.
Sources
livescience.comScientists identify rare genetic mutation that dramatically raises risk of lung cancer in nonsmokers
news-medical.netStudy identifies powerful inherited risk factor for lung cancer
miragenews.comRare Genetic Mutation Tied to Lung Cancer in Non-smokers
nytimes.comRare gene drastically raises lung cancer risk in those who never smoked