Sharon Belvin's nightmare with cancer began in 2004, when she was just 22.
Belvin was an avid runner but said she suddenly found she couldn't climb the stairs without "a lot of difficulty breathing."
Eventually, after months of fruitless treatments for lung ailments like bronchitis, she was diagnosed with melanoma — a very serious skin cancer. It had already spread to her lungs, and the prognosis was grim. She had about a 50-50 chance of surviving the next six months.
"Yeah, that was the turning point of life, right there," she says.