With the numbers of vaccines steadily increasing, the possibility that they are contributing to the cancer epidemic also increases. Although, even for so-called “cancer vaccines” such as HPV and Hepatitis B vaccines, there are valid reasons to think this, vaccine manufacturers don’t test their products for their potential to produce cancer. Carcinogenic chemical additives, fractionated and otherwise-synthetic biological ingredients, and DNA-transforming contaminants together with vaccine-induced predisposition to autoimmunity is a recipe for this disease. But, with most cancers taking many years or decades to develop, it’s difficult, if not impossible, to prove causation.