Def Leppard rocker Vivian Campbell is celebrating after another thumbs up from doctors in his ongoing cancer battle.

The guitarist announced he was in remission in November (13), but had to backtrack when medics advised him the cancer had returned.

Now, Campbell reveals he's cautiously optimistic after receiving his latest prognosis.

In a new post, he writes, "I'm currently in Boston and I did a scan on Tuesday morning. The scan shows that the cancer is in remission. Great news, but I'm trying not to get too excited about it, as I heard that same phrase late last year - only to be disappointed again a few months after when it returned."

The rocker confirmed he had been diagnosed with Hodgkin's lymphoma last summer (13), but his cancer battle isn't keeping him from playing and touring - he is continuing chemotherapy treatment in between Def Leppard dates this summer (14).

And he adds, "The plan is to do a stem-cell transplant as soon as the tour is finished. However, to keep me in remission, my doctors have recommended that I do another, third round of the chemo, so I'm back in hospital, all hooked up and doing my rock 'n' roll drugs."

Def Leppard are currently on tour with Kiss.