In 2006, Vicidomini was diagnosed with lymphoblastic lymphoma.
"That's kind of when my life turned upside down," Vicidomini said on the 'Today' Show.
This also marked the beginning of Vicidomini's experience with Four Diamonds organization, which helped the Vicidominis pay for costs that insurance didn't cover for the treatment.
"It gives you hope. It gives you a little sense that you can have a regular life," Dennis Vicidomini, Nick's father, said.
In 2007, Vicidomini attended his very first THON.
"It was the best weekend of my life up to that point," Vicidomini said on the TODAY Show. "That was the first time since my diagnosis that I was treated like a kid."