Mastering Science: Breast Cancer and Body Rhythms!

Could working the night shift alter a woman's body clock enough to cause breast cancer?
"One minute you're a healthy person, the next minute you have breast cancer."

Ettamay (last name withheld) is up early these days. She lives a much different life than she did when she was a nurse working the night shifts. She would be just getting to sleep at this early morning hour.

"I was always exhausted," she says. "I don't know any of the nurses, especially the night shift gals, that weren't exhausted all the time."

She wonders if her crazy work schedule might have contributed to her breast cancer.

Virginia Tech molecular biologist Carla Finkielstein says studies back up Ettamay's suspicions.