Kenneth Glad
Most people assume avoiding cigarettes guarantees protection from severe respiratory disease. That sense of safety has just been shattered. A rare inheritance is silently driving a devastating illness, completely bypassing the need for smoke.
Up to twenty percent of lung cancer cases in the United States strike people who never smoked. Scientists have long suspected a genetic link. While previous data highlighted markers common in Asian populations or linked to breast cancer, the full picture remained unclear. A new study published in Science confirms just how powerful that connection can be.
Researchers at the Dana Farber Cancer Institute examined a specific genetic mutation called EGFR T790M. Experts first spotted this rare variant in a European family back in 2005, but they never fully grasped its devastating potential. The new results were staggering. People with this mutation face a lung cancer risk that is twenty-five times higher than average.
For lifelong nonsmokers, the danger is even sharper. Carriers in that group face a sixty-fold increased risk compared to other nonsmokers. Because healthy nonsmokers naturally have lower base rates of the disease, this massive spike shows exactly how heavily the rogue gene dictates health outcomes.
Dr. Jaclyn LoPiccolo co-led the research. “This mutation is so rare that we weren’t able to get population-level risk estimates without the size of a database like that from 23andMe,” she told Time.
Searching for answers
The team used a massive database from the 23andMe Research Institute to map the problem. Only about one in 15,000 Americans carries the variant.
Researchers found it is much more common in Southern Appalachia, where rates jump to about one in 2,000. Scientists believe a single carrier brought the mutation from England or Ireland over 200 years ago.
Nadia Litterman of the Susan Wojcicki Foundation believes this data could change preventative care. The foundation actually funded the genetics study that provided data for this new analysis.
“I do think that understanding your risk of lung cancer, especially from a genetic perspective, along with your exposures to things like radon and other environmental factors, would be really valuable,” Litterman told Time.
Current medical rules do not recommend lung scans for healthy nonsmokers. Doctors currently reserve those tests for older people with a heavy smoking history.
Litterman hopes the findings will eventually shift that standard. She points to BRCA genetic testing for breast cancer as a clear model for catching lung tumors early.
One patient’s fight
Frank McKenna, a personal trainer from Virginia Beach, discovered he had the disease in 2016. He had never smoked or worked around environmental risks like radon.
“I was shocked when I was diagnosed with Stage IV lung cancer after the only symptom I had was a little cough,” he told Time.
Doctors tested fluid drained from his lung and found the rare mutation. The cancer had already spread to his bones, but medical staff quickly prescribed a targeted daily pill to neutralize the rogue gene.
“When I started that targeted therapy, which is a pill I take once a day, within a couple of days, I could feel a difference. I could feel my life coming back.”
His 33-year-old daughter recently tested positive for the exact same genetic marker. She discovered this after joining a study following a separate melanoma diagnosis.
Because no clear screening rules exist for her situation, McKenna strongly advocates for updated testing guidelines. He hopes other families can catch the illness at an early stage, long before it spreads and limits their options.
Sources: Time, Science, Dana Farber Cancer Institute, 23andMe
