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Cancer-causing virus associated with higher risk of new HIV infection
May 01, 2009Infection with anal human papillomavirus (HPV), a virus that can cause anal and cervical cancers, is associated with a higher risk of new HIV infection in previously HIV-negative men who have sex with men (MSM), according to new UCSF research.
Reported online ahead of print in the journal AIDS, the findings are available now. They are scheduled for publication in an upcoming print issue.
In previous studies, other sexually transmitted infections have been associated with higher risk of HIV infection and HPV is the most common sexually transmitted infection.
"We looked at HIV-negative men who have sex with men who were at high risk for HIV infection and who had multiple risk factors. Our results showed a strong independent association for increased risk of HIV acquisition among those men who were already infected with anal HPV," said the study's lead investigator, Peter V. Chin-Hong, MD, associate professor of clinical medicine and director of the program in transplant and immunocompromised host infectious diseases at UCSF.
The 1400 study participants were part of the EXPLORE trial, a large clinical trial to test the efficacy of a behavioral intervention for HIV-negative MSM with sites in Boston, Denver, New York and San Francisco. Risk factors were calculated from those men who became HIV-infected over the course of the trial and infections were identified by blood tests.
"We think that HPV enhances susceptibility to HIV infection through two mechanisms. Anatomically, the virus causes anal lesions. These lesions bring blood vessels closer to the surface and also the lesions' skin layer is thinner and more easily shredded, which frequently causes bleeding. These disruptions of the mucosal barrier could allow easier entry for HIV," said Chin-Hong.
In addition, HPV activates the immune system. The inflammatory cells recruited to the HPV lesions-dendritic cells, macrophages and CD4 T cells-are the immune cells most susceptible to HIV infection.
HPV vaccine has been found effective in preventing acquisition of the virus by women. Clinical trials testing the effectiveness of the vaccine among MSM are currently under way.
"To date, the focus of attention on HPV has been almost exclusively on its key role in causing squamous cell cancer. This study points to another important means by which HPV infection may be associated with morbidity and mortality, i.e., through potentiation of HIV infection. A direct role for HPV in this process will need to be confirmed in additional studies, and additional studies will be needed to understand the mechanisms by which HPV may do this, said the study's senior investigator and author, Joel Palefsky, MD, professor of medicine and director of the Anal Neoplasia Clinic at UCSF.
"But it is encouraging to note that to the degree that HPV truly plays a role in increasing the risk of acquiring HPV infection, primary prevention of HPV infection through HPV vaccination may potentially reduce that risk," he added.
University of California - San Francisco
"We looked at HIV-negative men who have sex with men who were at high risk for HIV infection and who had multiple risk factors. Our results showed a strong independent association for increased risk of HIV acquisition among those men who were already infected with anal HPV," said the study's lead investigator, Peter V. Chin-Hong, MD, associate professor of clinical medicine and director of the program in transplant and immunocompromised host infectious diseases at UCSF.
The 1400 study participants were part of the EXPLORE trial, a large clinical trial to test the efficacy of a behavioral intervention for HIV-negative MSM with sites in Boston, Denver, New York and San Francisco. Risk factors were calculated from those men who became HIV-infected over the course of the trial and infections were identified by blood tests.
"We think that HPV enhances susceptibility to HIV infection through two mechanisms. Anatomically, the virus causes anal lesions. These lesions bring blood vessels closer to the surface and also the lesions' skin layer is thinner and more easily shredded, which frequently causes bleeding. These disruptions of the mucosal barrier could allow easier entry for HIV," said Chin-Hong.
In addition, HPV activates the immune system. The inflammatory cells recruited to the HPV lesions-dendritic cells, macrophages and CD4 T cells-are the immune cells most susceptible to HIV infection.
HPV vaccine has been found effective in preventing acquisition of the virus by women. Clinical trials testing the effectiveness of the vaccine among MSM are currently under way.
"To date, the focus of attention on HPV has been almost exclusively on its key role in causing squamous cell cancer. This study points to another important means by which HPV infection may be associated with morbidity and mortality, i.e., through potentiation of HIV infection. A direct role for HPV in this process will need to be confirmed in additional studies, and additional studies will be needed to understand the mechanisms by which HPV may do this, said the study's senior investigator and author, Joel Palefsky, MD, professor of medicine and director of the Anal Neoplasia Clinic at UCSF.
"But it is encouraging to note that to the degree that HPV truly plays a role in increasing the risk of acquiring HPV infection, primary prevention of HPV infection through HPV vaccination may potentially reduce that risk," he added.
University of California - San Francisco
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Study: Benefit to women not enough to sway men to get HPV vaccine
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HPV-vaccine may prevent preterm births
Chronic human papilloma virus (HPV)-infections can lead to cellular changes in the cervix that can be a pre-stage to cervical cancer. Surgical treatment of these pre-stages gives an increased risk of preterm birth in subsequent pregnancies.
Both Latino and non-Latino women likely to accept HPV vaccination for selves and children
Most women responding to a survey conducted at Massachusetts General Hospital (MGH) clinics indicated they would be willing to be vaccinated against the human papillomavirus (HPV) and to have their daughters and even sons vaccinated in order to prevent cancer in their children.
UAB researchers report breakthrough in HPV research
UAB (University of Alabama at Birmingham) researchers have developed a new, inexpensive and efficient method for producing and studying a type of human papillomavirus (HPV) that causes cervical cancer. The process could speed understanding of how the virus functions and causes diseases, and lead to new prevention or treatment options.
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