Articles I ran into when looking for cancer mineral oil.
...many of these synthetic chemicals have not been approved by regulation authorities, but find their way into products and onto shelves through loopholes in regulations as much as a third of personal care products contain at least one chemical linked to cancer mineral oil and petroleum are the basic ingredients in many cosmetic products. 
Now some petroleum products are known to cause cancer, but just because mineral oil is from petroleum doesnt mean that its also a cancer causing agent. Some petroleum products contain compounds such as polycyclic aromatic compounds which are cancer causing, but mineral oil is not one of them. 
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- Mineral oil cancer scare