Abstract
BackgroundThe Human Papillomavirus (HPV) is generally recognized to be the direct cause of cervical cancer. The development of effective anti-HPV vaccines, included in the portfolio of recommended vaccinations for any given community, led to the consolidation in many countries of immunization programs to prevent HPV-related cervical cancers. In recent years, increasing evidence in epidemiology and molecular biology have supported the oncogenic role of HPV in the development of other neoplasm including condylomas and penile, anal, vulvar, vaginal, and oro-pharyngeal cancers. Men play a key role in the paradigm of HPV infection: both as patients and as part of the mechanisms of transmission. Data show they are affected almost as often as women. Moreover, no screening procedures for HPV-related disease prevention are applied in men, who fail to undergo routine medical testing by any medical specialist at all. They also do not benefit from government prevention strategies.DiscussionA panel of experts convened to focus on scientific, medical, and economic studies, and on the achievements from health organizations’ intervention programs on the matter. One of the goals was to discuss on the critical issues emerging from the ongoing global implementation of HPV vaccination. A second goal was to identify contributions which could overcome the barriers that impede or delay effective vaccination programs whose purpose is to eradicate the HPV infection both in women and men.SummaryThe reviewed studies on the natural history of HPV infection and related diseases in women and men, the increasing experience of HPV vaccination in women, the analysis of clinical effectiveness vs economic efficacy of HPV vaccination, are even more supportive of the economic sustainability of vaccination programs both in women and men. Those achievements address increasing and needed attention to the issue of social equity in healthcare for both genders.
Highlights
Introduction to male vaccinationOne of the main goals of vaccination programs is to stop the transmission of an infective agent
When the infection caused by high risk (HR) genotypes of Human Papillomavirus (HPV), persists – in 5% to 10% of infected women – there is a high probability of developing precancerous lesions of the cervix, which can progress to invasive cervical cancer
The types of HPV that cause anogenital warts (AGW) are different from the types that can cause anogenital cancer; subjects with low risk (LR) HPV types should be considered at higher risk of having cancer by HPV 16 in the future
Summary
Natural history of HPV infection in women and men The increased understanding of the natural history of HPV infection recently supported one of the main breakthroughs of medical science. Several key points could help in the extension of HPV vaccination programs to men such as: female-only vaccination will not protect all men; HPV-related head and neck cancer burden is carried mainly by men; it is the fastest way to achieve female protection by means of herd-immunity; vaccinating males is a more genderequitable public health policy; men seem to accept vaccination as do parents of boys; vaccine seems to elicit the same if not a higher degree of immunogenicity in boys than in girls; genital warts and HPV-related cancers in men represent costly and emotionally burdensome and preventable conditions; lessons from the past with other vaccines show that single-gender-based vaccination policies are less effective. The HPV4 vaccine has proved to be effective and safe in men, but whether this is enough to recommend inclusion of males in NHS prevention strategies is still being debated Several factors such as vaccine efficacy, herd immunity, vaccine coverage rates in females, burden of disease in men, and cost-benefit ratios need to be further evaluated when including men into the formula
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