Inherited EGFR T790M mutation raises lung cancer risk, with a hotspot in the US Southeast; study traces ancestry and suggests targeted screening.

Researchers have identified an inherited EGFR T790M mutation that significantly increases the risk of lung cancer and is concentrated in the southeastern United States.

Genetic link uncovered

The team analyzed DNA samples from thousands of individuals and found that carriers of the T790M variant face a markedly higher probability of developing lung cancer compared with non‑carriers. The mutation, which alters the epidermal growth factor receptor, is known to drive tumor growth when present in somatic cells; this study shows that an inherited form also poses a serious health threat.

Geographic enrichment

By mapping the geographic distribution of carriers, the researchers discovered a pronounced enrichment in states across the Southeast, including Georgia, Alabama and the Carolinas. The pattern suggests a founder effect, where a single ancestral carrier passed the mutation to descendants over many generations.

Ancestral tracing

Using genealogical data and population‑genetic modeling, the investigators traced the mutation’s lineage back several hundred years. "The allele appears to have originated in a common ancestor whose descendants remain clustered in this region," the lead author said. The study highlights how historic migration and settlement patterns can shape modern disease risk.

Public‑health implications

Health officials may need to consider targeted screening for at‑risk populations in the identified hotspot. Early detection of lung cancer in carriers could improve outcomes, especially as new targeted therapies for EGFR‑mutated tumors become widely available.

While the findings illuminate a clear genetic risk factor, the authors caution that lifestyle factors such as smoking still play a major role in lung cancer incidence. They recommend integrating genetic testing with traditional risk assessments to refine prevention strategies.

The research adds to a growing body of evidence that inherited mutations can drive cancer susceptibility in specific communities, underscoring the importance of precision public health.