Immunotherapy Is Changing Cancer Treatment Forever His brain tumor was a hopeless case. Then an experimental medicine made it melt away. Tom Fraser in June. Photo: Bobby Doherty Tom Fraser in June. Photo: Bobby Doherty Tom Fraser in June. Photo: Bobby Doherty One morning at the end of April 2023, Marcela Maus, a cancer researcher at Mass General in Boston, got a call from her colleague Bryan Choi. “He called me, and he’s like, ‘Oh my God, oh my God, oh my God!’ And I’m like, ‘What is going on?’”...