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Researchers Report Clue to Severity of Cystic Fibrosis

Posted January 29, 2008

About 30,000 people in the United States have cystic fibrosis, a life-threatening disease that often leads to lung damage. The severity of the disease varies, and new research has found one reason why some patients do worse than others.

Stacy Danko was diagnosed with cystic fibrosis when she was a child. Now in her 40s, she wonders why her sister, Chrissy, died from the disease at age 12, yet her own disease never seemed as severe.

“I think every day, 'Why? Why am I so fortunate?'” Danko said.

Researchers collected data from the U.S. Cystic Fibrosis Twin and Sibling Study. They compared exposure to second-hand smoke in the home with a gene abnormality that some patients carry.

“What we really wanted to know is what makes one patient or helps one patient do better than another,” said Dr. Garry Cutting with Johns Hopkins University.

Out of about 800 patients studied, those exposed to second-hand smoke lost, on average, 10 percent of their lung function compared with those not exposed. When those patients also carried a specific gene abnormality, their loss of lung function doubled to about 20 percent.

That might explain why the disease is more severe in some patients than others.

“For the first time, we now see that other genes play a role in how bad that effect is on the lungs of cystic fibrosis patients,” Cutting said.

The study appeared in the Journal of the American Medical Association. Danko and her sister were both exposed to second-hand smoke as children, and her boyfriend smokes. She'd like to know if she carries the gene.

“If you know you carry the gene that is going to make it affect you more, then you're going to be that much more careful,” Danko said. “You're going to be more open with individuals smoking around you. You'll just avoid it.”

Danko said she still hopes for a cure and tries to protect the 40 percent lung function she has left.

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  • St Ives Feb 1, 2008

    Rockenhorse you are so right. Several years ago I dated aman who smoked and when I told him it was not an option,he quit. As far as a parent smoking in the home of a child with this dreaded disease... they should be chastised and more.

  • Rocknhorse Jan 31, 2008

    Hoping that the researchers can find a cure!

    A bit of chastising, however! If you are close to someone with this disease, how in the world can you smoke in their presence? With the knowledge we have about cigarette smoke and the damage it causes to lungs, how can someone smoke in the presence of another who has a lung disease? That just makes no sense to me.