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Leeds medics solve an ancient riddle -- and offer new tool for diagnosis
Date:5/30/2008

A puzzling medical condition, identified more than 2,000 years ago by Hippocrates, has finally been explained by researchers at the University of Leeds.

The phenomenon of "finger clubbing", a deformity of the fingers and fingernails, has been known for thousands of years, and has long been recognized to be a sign of a wide range of serious diseases especially lung cancer.

"It's one of the first things they teach you at medical school," explained Professor David Bonthron of the Leeds Institute of Molecular Medicine. "You shake the patient by the hand, and take a good look at their fingers in the process."

Lung cancer, heart disease, hyperthyroidism, various gastrointestinal diseases and many other conditions all result in finger clubbing. But exactly why swollen, reddened fingers should be an indicator of serious illness has remained a mystery until now.

"There are benign cases of clubbing, where it isn't associated with other illnesses, but particularly because of the link to lung cancer, it is generally regarded as rather sinister," said Bonthron. "You look at the range of conditions connected to finger clubbing and wonder what on earth they could have in common."

The researchers found clues in the medical literature, detailing past cases and previous research. "We knew that in cystic fibrosis patients who have undergone a lung transplant, their finger clubbing goes away. The same goes for empyema patients who have had their lungs drained. It suggested that impaired lung function was somehow crucial to finger clubbing but we didn't understand how."

Prof Bonthron, Dr Chris Bennett of the Yorkshire Regional Genetics Service and their colleagues studied a group of patients suffering from inherited primary hypertrophic osteoarthropathy (PHO), a genetic disorder in which the finger clubbing is accompanied by painful joint enlargement and a thickening of the bone.

Their findings implicated a
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Contact: Simon Jenkins
S.Jenkins@leeds.ac.uk
44-011-334-34031
University of Leeds
Source:Eurekalert  

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