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New Indicator For Identifying Throat Cancer Risks

January 16, 2012 By AxoGen, Inc.

(PRNewswire-USNewswire) Researchers at the University of Michigan Health System have found a new indicator that may predict which patients with a common type of throat cancer are most likely have the cancer spread to other parts of their bodies. Patients with oropharyngeal squamous cell carcinoma who had matted lymph nodes – nodes that are connected together – had a 69 percent survival rate over three years, compared to 94 percent for patients without matted nodes, according to a study published online ahead of print publication in Head & Neck.

“The spread of cancer throughout the body accounts for about 45 percent of the deaths from oropharyngeal carcinoma,” says the study’s senior author, Douglas B. Chepeha, M.D., M.S.P.H., an associate professor of otolaryngology head and neck surgery at the U-M Medical School. “Our findings may help doctors identify patients who are at higher risk for having their cancer metastasize and who would benefit from additional systemic therapy. Conversely, some patients without matted nodes may benefit from a reduction of the current standard treatment, which would cut down on uncomfortable side effects.”

Notably, the findings indicate an increased risk independent of other established prognostic factors, such as the patient’s history of smoking or whether they have the Human papillomavirus (HPV), the study found. Smoking (tobacco and marijuana), heavy alcohol use and HPV infection have each been linked to the development of oropharyngeal squamous cell carcinoma.

Matted nodes appear to be an especially strong indicator of increased risk among patients who are HPV-positive, even though HPV-positive patients had better overall outcomes than their HPV-negative peers. The patients with the best outcomes were HPV-positive non-smokers. “It’s not clear why we’re finding these survival differences for patients who have matted nodes,” says study lead author Matthew E. Spector, M.D., a head and neck surgery resident at U-M who won a national award from the American Head and Neck Society for this work.

“It is possible that there are biological and molecular differences in these types of tumors, which can be explored in future research.” The results affirm the value of having a team of doctors and researchers from different specialties – radiology, oncology, biostatistics and surgery – working together to find advances that can directly benefit patients, Chepeha says. “This was a collaborative effort and all of the authors made important contributions,” he adds.

The study tracked 78 cancer patients who were part of a clinical trial evaluating two cancer drugs in combination with intensity-modulated radiation therapy. All the patients had stage III or IV squamous cell carcinoma of the oropharynx and had not had any previous treatment. Sixteen of the 78 patients had matted nodes.

“It’s significant that we’ve identified this new marker that can help us predict which patients have worse survival odds,” Chepeha says. “Now we need to go one step further and figure out what mechanisms are at work and how we can use this knowledge to improve survival rates.” An estimated 52,140 people will be diagnosed with head and neck cancer this year, and an estimated 11,460 people will die from the disease, according to the American Cancer Society.

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