He said: “The good news is, I’m not gonna go into any more detail. I’m posting this, because professionally, a few things will have to change – appearances and cons and work in general need to take back seat to treatment.
“My plan is to get as well as I possibly can over the summer so that I can tour with my new movie Ernie + Emma this fall.
“There are several cons this year that I have to cancel. Big regrets on my part. Treatment needs and professional obligations don’t always go hand-in-hand.
“That’s about it. I’m not trying [to] enlist sympathy – or advice – I just want to get ahead of this information in case false information gets out (which it will).”
Campbell didn’t go into specifics about his cancer diagnosis, but the star reassured fans he expects to be “be around for a while”, and he thanked them for their support.
He added: “Fear not, I am a tough old son-of-a-b***h and I have great support, so I expect to be around a while.
“As always, you’re the greatest fans in the world and I hope to see you soon!”
Campbell appeared opposite Ellen Sandweiss and Betsy Baker in the Evil Dead film franchise.