Tobacco, UV rays, viruses, heredity, and age are the main causes of cancer.

From some dilatory reading in the early 1960s, I knew enough about viruses and their association with tumors in animals to understand that they might provide a relatively simple entry into a problem as complex as cancer.

Every cancer looks different. Every cancer has similarities to other cancers. And we're trying to milk those differences and similarities to do a better job of predicting how things are going to work out and making new drugs.

I believe that we are going to have a much deeper appreciation of what kinds of abnormalities in cancer cells and in the surrounding cells that feed and respond to cancers are vulnerabilities that will allow us to make better predictions of which kinds of drugs will work to treat these cancers.

Syntactic sugar causes cancer of the semicolon.

For those who smoke cigarettes, marijuana has 50 percent more tar and volatile cancer-inducing compounds, ... It causes emphysema, changes hormones, changes a whole bundle of things. It is quite a toxic chemical.