When we think about lung cancer, the biggest environmental factor is without doubt smoking. Um, that would make a huge impact and has made a huge impact on the incidence of lung cancer. We have to keep pushing that and making it clear to everybody why smoking is so dangerous.

The four most common cancers that account for about 80 percent of all cancer deaths are lung, breast, colorectal cancer, and prostate cancer.

There are clearly environmental factors that can decrease the incidence and death from cancer. I would still say though that the majority of cancers cannot be prevented at this point, but they can be treated and they can be treated two major ways.

Probably all of us have random rogue cancer cells floating around in our bodies but by and large, in the majority of cases, our immune system circulates and acts as a surveillance mechanism and kills off those few tumor cells.

The biggest risk factor for cancer is aging.

The key to HIV/AIDS was to say let's give a patient multiple different therapies at the same time and that makes the virus much less likely to mutate.

If one has a routine colonoscopy at the age of 50 and then colonoscopies thereafter as the physician recommends, you could largely prevent colon cancer, you could detect it in its very earliest stages and cure it.