Campbell announced Monday on social media that he has an incurable form of cancer and has to cancel several upcoming appearances. “ The Evil Dead ” star Bruce Campbell on Monday revealed he has been diagnosed with cancer, announcing the news with both lighthearted humor and solemnity — as only a beloved face of several horror-comedies arguably could. “Hi folks, these days, when someone is having a health issue, it’s referred to as an ‘opportunity,’ so let’s go with that — I’m having one of