HPV-Related Tonsillar Cancer on the Rise in Canada

by Bidita Debnath on  August 14, 2013 at 11:18 PM Research News   - G J E 4
European and American research shows an alarming increase in the rate of tonsillar cancer related to the human papilloma virus (HPV), which is a sexually transmitted virus.
 HPV-Related Tonsillar Cancer on the Rise in Canada
HPV-Related Tonsillar Cancer on the Rise in Canada

Experts suggest a similar trend has emerged in Canada, but it had yet to be confirmed through scientific analysis. In a new study published in Current Oncology, a group of researchers from Lawson Health Research Institute and Western University have produced evidence confirming this epidemic.

Orophararyngeal cancer impacts part of the throat, including the tonsils and the base of the tongue. Historically, these types of throat cancers were caused by smoking and alcohol use, but recent studies show that HPV is now a major cause. When an individual contracts HPV, the virus's DNA can infiltrate healthy cells and induce cancer years later.

As sexually-transmitted diseases become increasingly common, American and European data shows the rates of HPV-related tonsillar cancer are also climbing at an alarming rate. To assess the impact in Canada, a team of researchers led by Drs. Anthony Nichols, David Palma, who is also a Clinician-Scientist at the Ontario Institute for Cancer Research, and Marina Salvadori led a retrospective study of throat cancer patients at London Health Sciences Centre (LHSC).

Looking at three different time periods - 1993-1999, 2000-2005, and 2006-2011 - the study team searched the LHSC pathology database for patients with tonsillar cancer diagnosed during those time periods. The team then reviewed each patient's chart for information on diagnosis, treatment, and follow-up, and analyzed their biopsy samples to determine whether HPV was present in their DNA.

In total, 160 patient records were identified with sufficient data for analysis. HPV was detected in 57% of cases, most commonly amongst young non-smokers. Results show the incidence of these cancers rose significantly over each time period. Over the same period, treatment generally evolved from radiation to a concurrent mix of chemotherapy and radiation. Survival rates also improved significantly; recurrence free survival increased from 53% to 82%, and 5-year survival rates increased from 37% to 83%.

While these results show positive patient outcomes, they also suggest serious complications for the available health resources in Canada. Unlike traditional throat cancer patients, those with HPV-related tonsillar cancer are younger, healthier, and more likely to survive their disease. New treatments allow them to live longer, but also expose them to more concentrated levels of toxicity, and make them more reliant on health care resources for a longer period of time. Existing vaccinations can help to prevent this disease, but uptake across the nation has been limited.

"Based on this data, we can anticipate a major impact on the Canadian health care system and the patients it serves," says Dr. Nichols. "We now need to seriously consider strategies to prevent the disease including vaccinations, and to continue to develop better treatments with fewer side effects in order to preserve patient quality of life."

Source: Eurekalert

Post your Comments

Comments should be on the topic and should not be abusive. The editorial team reserves the right to review and moderate the comments posted on the site.
User Avatar
* Your comment can be maximum of 2500 characters
Notify me when reply is posted I agree to the terms and conditions

You May Also Like

View All