He's been battling the disease throughout the recording process of Def Leppard's self-titled 11th album. And he says he's hopeful of good news come December.

Campbell tells radio station 100.7 WZXL: "I'm taking this drug called pembrolizumab. I'm part of a phase two clinical trial. I don't actually know if it's working yet. I'll find out in early December.

"My doctors and I are going to sit down and have a look and see if it's holding the cancer at bay or shrinking the tumours. If it is, I'll be able to continue this treatment for a couple of years, which will be the best possible outcome. If not, then I've got to reconsider my options.

"But I'm hopeful. I started this treatment six months ago, and it's been fantastic because it meant I was able to continue working as opposed to doing a more traditional treatment which would have meant I would have had to miss the tour." Read more and stream the full interview - here.

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