Oral sex is the main form of transmission of HPV

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Oral sex is the main form of transmission of HPV among the interviewees

Search has evaluated 1.300 people lesions and tumors in the head and neck.

São Paulo - A new study by the USP School of Public Health shows that 72% of head and neck cancer cases have the virus HPV, mostly transmitted in unprotected sex.

Oral sex without Condom would be the main route of transmission of HPV

Experts warn that the relationship between this virus and tumors in the tongue, throat and pharynx is through oral sex without Condom. The new research, released by Agência FAPESP, was done with 1.475 Brazilian patients.

“We did two types of tests to check the prevalence of infection with HPV among 1.475 patients: serology and DNA analysis, ”said Rossana Verónica Mendoza López, author of the analysis.

Considering the results only for the HPV 16 type - the most related to the development of head and neck cancer among the existing 200 virus types -, the prevalence of positive cases among the study patients was 72%. In the older assessments made between the years 1998 and 2003, the index found was 55%, an increase of 17 percentage points.

Less lethal

When analyzing the survival of the patients, the scientists observed that, among those that presented a positive result for the HPV, the mortality was 38% lower.

“International studies have shown that the HPV has more relation with oropharyngeal tumors. The results of our study suggest, therefore, that cases of head and neck cancer with HPV have longer survival, that is, they have a better prognosis. But we still don't know exactly why, ”said López.

According to Victor Wünsch Filho, professor and research advisor, the demographic profile and habits of life of the patients who presented positive results for the HPV 16 is a possible explanation for the best prognosis.

“They form a group of younger patients, with a higher proportion of women and a lower proportion of smokers. This data deserves further analysis, ”said Wünsch.

According to Lopez, although the evidence indicates that HPV is becoming a more common cause of head and neck cancer, tobacco and alcohol consumption still account for most cases.

THE ONLINE DAY - RJ | SCIENCE AND HEALTH

STD, AIDS AND VIRAL HEPATITIS

04/07/2012

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