Yes that's true, but I think a lot of the knee-jerk reaction isn't intended to communicate "Stop researching cancer" it's more intended to communicate "Stop linkbaiting us."
If the title said "Might someday" then that would probably be a more accurate picture of where something at this stage of research is at.
Obviously some people here want to know all up-and-coming possibilities, clinical trials, or longshots because we're nerds about it. But others of us only care about the ones that are already succeeding in people. Having titles differentiate the two can avoid the frustration.