Cancer Facts

Dogs can be trained to identify the scent of lung cancer long before symptoms develop.

Cigarette smoke contains over 7,000 chemicals, at least 70 of which are known to cause cancer.

There are more than 1,000 chemicals in a cup of coffee. Of these, only 26 have been tested, and half caused cancer in rats.

Medical research has found substances in mistletoe that can slow down tumor growth.

There is a genetic disease called Laron syndrome that results in short stature, longer life expectancy, and near immunity to cancer and diabetes - amongst other things.

Keanu Reeves quietly donated millions to children's hospitals and cancer research throughout his career, rarely publicizing his contributions. He also devoted years to supporting his sister Kim during her decade-long battle with leukemia, which she overcame in the early 2000s.

At 15, Jack Andraka won the top prize at the 2012 Intel Science Fair for developing a concept for an early pancreatic cancer detection test using carbon nanotubes. His preliminary results suggested it could be faster and cheaper than existing methods, though it has never been clinically validated.

After an 11 year study, cell phones were shown not to increase chances of getting cancer.

Alison Belsham needed a last-chance stem cell transplant, so doctors searched the world for a match - and found Rachel Rees, a Welsh woman living in Australia who grew up about an hour from Alison's home.

When his sister Kim was diagnosed with leukemia in 1991, Keanu Reeves put his career on hold, sold his home to move closer to her, and spent a decade cooking her meals, cleaning her house, and personally administering her medications. Kim told PEOPLE magazine in 1995: "My brother is my prince." She survived.