There is a magic bullet for some cancers. What if it misses?

Shahzad Bhat, 53, was working at the MGM Mansion in Las Vegas when his doctor gave him three months to live in October 2017. There were no more treatments available for his aggressive form of lymphoma. Like some of the elite gamblers who stayed at the casino, Bhat got lucky. A day before his appointment, an experimental cancer drug from Gilead Sciences Inc.