Dave Coulier, Star Of "Full House," Revealed He Has Stage 3 Non-Hodgkin Lymphoma

Several members of Dave's family also went through cancer, which he shared as inspiration for how to navigate the process. "I lost my mom to breast cancer. I lost my sister Sharon to breast cancer. She was 36 years old. I lost my niece, Shannon. She was 29 years old," he said, including that his sister Karen is going through cancer as well.

"I saw what those women in my family went through, and I thought to myself, 'If I can be just 1/10th of a percent as strong as they were, then I'm going to be just fine," he added.

"[Karen] was a registered nurse, and so she's seen this from different optics than I have," Dave described. "She's been so supportive, and she's funny. So we're making jokes about this. One of my jokes is in four short weeks, I've gone from a Virgo to a Cancer. I'm a huge hockey fan. So when they said, 'You've got NHL,' I thought, 'I finally made it to the NHL.'"