HPV-caused throat cancer no danger to partners

Long-term partners of patients with mouth and throat cancers related to infection with the human papillomavirus (HPV) appear to have no increased prevalence of oral HPV infections, according to results of a multi-centre, pilot study led by Johns Hopkins investigators. The study’s results suggest that long-term couples need not change their sexual practices.

“While we can’t guarantee that the partners of patients will not develop oral HPV infections or cancers, we can reassure them that our study found they had no increased prevalence of oral infections, which suggests their risk of HPV-related oral cancer remains low,” says Gypsyamber D’Souza, PhD, MPH, associate professor of epidemiology at the Johns Hopkins University Bloomberg School of Public Health.

Persistent oral HPV infections are a risk for developing oropharyngeal cancers, located at the base of the tongue, tonsils, pharynx and soft palate. Researchers conducted surveys in four hospitals and took oral rinse samples from 166 male and female patients with HPV-related oropharyngeal cancers and 94 spouses and partners. The scientists also studied patients’ tumour samples and performed visual oral examinations of partners. Of the 94 partners, six were male.

More than half of patients had at least one type of HPV DNA detectable in their oral rinses, including HPV16, the viral type most commonly associated with oral and other cancers. After a year, only seven patients (six percent) still had oral HPV16 DNA detectable.

Of the 94 partners, six had oral HPV infections (6.5 percent). Among the six, none of the men and two of four females (2.3 percent) had HPV16 infections at very low levels. These infections were not detectable one year later. No oral cancers were detected among 60 partners who underwent a visual oral exam.

One spouse and one patient reported a history of cervical cancer. Two spouses reported a history of cervical pre-cancer, and three patients said they had previous spouses with cervical cancers, but these were self-reported, unconfirmed cases.

“The oral HPV prevalence among partners who participated in this study are comparable to rates observed among the general population,” said D’Souza. “We suspect that long-term spouses and partners have been exposed to HPV, like most of us, and appear to have cleared the virus.”

D’Souza and her colleagues recommend that long-term couples need not change their sexual practices. “Certainly, with new sexual partners, caution is always advised.”
More research is needed to determine the timeline of progression for HPV-related oral cancers and how HPV is transmitted and suppressed by the immune system, added D’Souza.

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