"Well, I seem to be in a good spot at the moment," he tells Eddie Trunk. "You can never be too certain with these things, 'cause they can come creeping back. But after three rounds of chemo over the last two years, I did a stem-cell transplant in October. And the first PET scan that I did on New Year's Eve came back really, really good - there's no sign of the tumors - so I'm hopeful that we're on the right path. I mean, that's certainly the way I've been thinking."

"I'm not letting it concern me at all. But continuing for the next few years, I'll be doing more scans and follow-ups and stuff, just to make sure, but I'm certainly feeling healthy, you know?!"

The guitarist - who got married this past summer - explains how his treatment has unfolded since the cancer returned after he revealed things were in remission in November 2013.

"For anyone who knew anything about cancer, they'd probably say, 'Well, that's not unusual,'" says Campbell. "But I didn't. I got my diagnosis in the spring of 2013 when we were doing the Las Vegas residency with Def Leppard. And as soon as we were done with that, I started six months of chemo."