What Quantum Computers do is solve optimization problems based on Big data that is not organized or sequenced such as... find the cure to cancer from a million experiments worth of data.
I recall a Japanese study from about 30 years ago that produced dramatic results in tumors using a seaweed extract. There are surprising results from dandelion root right now. And Teva stopped making Vermox when it became clear that it might be a cheap treatment for tumors. I don’t think quantum computers are the obstacle.