Study Casts Doubt that Gardasil Prevents Cancer

0 Flares Twitter 0 Facebook 0 LinkedIn 0 Google+ 0 0 Flares ×

Human Papillomavirus

The number of HPV caused cancers is increasing. Journal of the National Cancer Institute (1)

If Gardasil prevents HPV cancer, why are these numbers increasing?

Gardasil prevents cancer. Or does it?

The media continues to publish articles saying that Gardasil prevents all types of cancer caused by the Human Papillomavirus (HPV). These cancers include cervical cancer, anal cancer, head and neck cancers, and more.

But do the facts say something different?

In recent years, “32 percent of girls aged 13 to 17 received all three doses of the HPV vaccine Gardasil or Cervarix in 2010” (1). The study showed that instead of seeing a decrease in HPV caused cancer, as expected, there was a surprising increase in HPV caused head, neck and anal cancers.

If Gardasil prevents cancer, why are these numbers increasing?

HPV vaccine

“Gardasil has not been proven to prevent cancer, despite the massive marketing message pushed by Merck Pharmaceuticals, the United States Department of Health, the FDA, the CDC and State health departments. The evidence just isn’t there.” – Greg Bennett, CBCD

In fact, the authors of a study published in Current Pharmaceutical Design in 2012 noted that, “We carried out a systematic review of HPV vaccine pre- and post-licensure trials to assess the evidence of their effectiveness and safety. We find that HPV vaccine clinical trials design, and data interpretation of both efficacy and safety outcomes, were largely inadequate.

Additionally, we note evidence of selective reporting of results from clinical trials (i.e., exclusion of vaccine efficacy figures related to study subgroups in which efficacy might be lower or even negative from peer-reviewed publications).

Given this, the widespread optimism regarding HPV vaccines long-term benefits appears to rest on a number of unproven assumptions and significant misinterpretation of available data.

For example, the claim that HPV vaccination will result in approximately 70% reduction of cervical cancers is made despite the fact that the clinical trials data have not demonstrated to date that the vaccines have actually prevented a single case of cervical cancer, nor that the current overly optimistic surrogate marker-based extrapolations are justified.

We thus conclude that further reduction of cervical cancers might be best achieved by optimizing cervical screening and targeting other factors of the disease rather than by the reliance on vaccines with questionable efficacy and safety profiles.” (1)

The bottom line?

More long term studies need to be conducted to provide a more comprehensive view as to the safety and efficacy of Gardasil.


(1) Tomljenovic L1, Spinosa JP, Shaw CA. ” Human papillomavirus (HPV) vaccines as an option for preventing cervical malignancies: (how) effective and safe?” Curr Pharm Des. 2013;19(8):1466-87.


Leave a Reply