September 8, 2016
People living with HIV are at increased risk for some cancers. This risk arises from several factors, including co-infection with viruses that have the potential to cause cancer, elevated rates of smoking and alcohol use, and ongoing exposure to proteins produced by HIV. Taking anti-HIV therapy (commonly called ART) and achieving and maintaining an undetectable viral load and the ensuing increase in CD4+ cell counts greatly helps to reduce cancer risk.
However, despite the use of ART, HIV still resides in a portion of cells of the immune system in lymph nodes and lymphatic tissues. Such infected cells produce viral proteins and may play a role in inflaming and activating the immune system. Potentially, these residual effects of HIV-infected cells could play a role in cancer risk. As HIV-positive people live longer thanks to ART, research is needed to assess their risk for cancer.
A team of scientists with the large database EuroSIDA have been collecting health-related information from clinics that care for HIV-positive people. The team's most recent analysis focused on nearly 16,000 people monitored between 2001 and 2012, of whom 610 (about 4%) developed at least one cancer. Over time, the proportion of cancers related to infectious causes decreased while cancers unrelated to infections increased. As HIV-positive people live longer, EuroSIDA expects that there will be more cases of cancer unrelated to infectious causes in the years ahead.
The EuroSIDA database analyses data from 108 clinics in 33 European countries as well as from clinics in Argentina and Israel. In the present analysis researchers focused on people whose data were captured between January 2001 and June 2012.
Researchers divided cancers into the following two groups:
The researchers listed the following as infection-related cancers:
All other cancers were considered unrelated to infections.
Although the EuroSIDA database has information on about 18,000 participants, the study team focused on 15,648 participants on whom it had detailed information for the study of cancer. The average profile of participants in the present analysis, when they entered the study, was as follows:
In total, 610 people (4%) developed 643 new cases of cancer during the study period. These cancers were distributed as follows:
Researchers stated that the "most common" infection-related cancers were as follows:
According to the researchers, "common" infection-unrelated cancers included the following:
The research team found that people who developed infection-unrelated cancers tended to be older (the average age was 54 years) and had higher CD4+ counts and lower viral loads than people who developed infection-related cancers.
Taking many factors into account, researchers found that overall, people 51 years and older had 12% more infection-related cancers than people aged 36 to 40 years. The factors strongly associated with this increased risk were as follows:
Overall, researchers found that for every decade in age beyond the 36-to-40-year category, the risk for cancers unrelated to infections doubled.
Among people who smoked, the risk of cancer unrelated to infection (chiefly lung cancer) was elevated in those aged 50 and older.
The EuroSIDA researchers noted that a trend emerged in the first half of 2009. That year, cancers unrelated to infections became the main type of cancer diagnosed. The researchers expect that cancers unrelated to infections will gradually increase in the foreseeable future for at least the following reasons:
The researchers did not forecast any change in the rate of cancers related to infections among people who injected street drugs. The lack of change in cancer rates in this population may arise because insufficient proportions of people who inject street drugs are receiving the psycho-social and other support necessary to manage their addiction, initiate ART and stay in HIV care (and in some cases in HBV- and HCV-related care too).
The EuroSIDA team urges clinics and research funding agencies to make infection-related cancers "a priority" in the coming years as higher proportions of HIV-positive people live past 50, 60 and 70 years. The team encourages clinics to "consider undertaking studies evaluating the cost-benefit of [cancer] screening programs for HIV-positive people and targeted preventive interventions such as cessation programs for smoking and alcohol use and vaccination [against cancer-causing viruses] ... to reduce the burden of avoidable cancers in the long-term."
HIV and aging -- CATIE
How to Say "I Quit" -- and Mean It -- The Positive Side
Smoking and tobacco -- Canadian Cancer Society
How to Quit Smoking -- The Lung Association
HPV, anal dysplasia and anal cancer -- CATIE fact sheet
HPV, cervical dysplasia and cervical cancer -- CATIE fact sheet
Hepatitis B -- CATIE fact sheet
Lymphoma -- CATIE fact sheet
|People With HIV Less Likely to Get Treated for Nine Major Cancers|
|A Closer Look at Cancer Among People Living With HIV|
|Taking a Closer Look at Cancer Treatment Rates Among Elderly Adults Living With HIV|
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