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Monday March 13, 09:37 AM
Saliva-based tests detect oral cancer
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Early diagnosis of oral cancer and Sjogren's syndrome, an autoimmune disease involving dry eyes, dry mouth and rheumatoid arthritis, may soon be possible with saliva-based tests, according to two presentations at the annual meeting of the American Association for Dental Research.
"If we can catch someone with oral cancer at stage 2 instead of stage 4, we can improve this person's five-year survival rate by 50 percent, which would be of tremendous service not only to the quality of life of the individual, but also to the healthcare burden of the country," senior investigator Dr David Wong told Reuters Health.
Wong's group at the University of California examined 350 saliva samples from patients with oral cancer and healthy comparison subjects.
Seven "messenger RNAs," which are used to build proteins, were increased in the patients with oral cancer.
Based on these findings, the researchers have developed a test that is fairly accurate in detecting oral cancer.
He noted that his group's test would be particularly useful for screening individuals with risk factors for oral cancer, including patients older than 45 years, smokers and alcohol drinkers.
Meanwhile, research by Dr Jane C Atkinson and colleagues at the National Institute for Dental and Craniofacial Research in Bethesda, Maryland, has shown that saliva from patients with Sjogren's syndrome can be differentiated from that of healthy control subjects by varying concentrations of proteins.
"This should allow us to diagnose patients more easily, to observe what actually happens to the salivary gland of patients with Sjogren's syndrome, to develop therapies to halt disease progression, to follow their progress during clinical trials, and to develop more effective saliva substitutes," Atkinson told Reuters Health.
She pointed out that a diagnosis of Sjogren's syndrome currently requires a biopsy of the salivary gland, which sometimes has to be repeated. Researchers have long hoped to develop a noninvasive test that can be used instead of biopsy, she added.
Atkinson's group used various tests to measure the protein profiles in saliva from 20 healthy comparison subjects and 41 patients with primary Sjogren's syndrome.
Their results showed that the concentration of eight inflammatory proteins were increased 2-fold or higher in patients' saliva, while two other proteins were decreased. Atkinson believes that replenishing these proteins in artificial saliva will make it more effective in treating patients' symptoms of dry mouth.
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