My life is sustained by medicine produced by large international pharma companies, and I also feel really uncomfortable about that.
I don't think badly of anyone who uses AI who makes a living because, survival. But on the other hand, I think the world would be better off without it. One can still wish for a better world while trying to survive in the current one using the tools at one's disposal, even if that situation is suboptimal.
And solving some cases of cancer is not worth the even greater medical problems AI will be foisting upon the world.
History has shown that we've never used technology to do that. We always go for the economic return first. We only use technology to ameliorate immediate pain, never to avoid long-term disaster.
Even green energy/solar panels - the CO2 curve hasn't been flattened because we're always constrained by business as usual. It's human instinct. I sincerely doubt AI can have a net positive impact because we're already seeing for every 1 good outcome, 100 greedy ones from the elite.
The latter is LLMs. Generative AI, chatbots, etc.
The former is analytical AI: machine-learning systems using computer vision techniques to recognize patterns in CT scans (and similar) that humans aren't precise enough to pick up on.
They are derived from similar principles, but no one is trying to sell DetectMelanomaChat as a replacement for you or me.
I’m not sure if your question misunderstands what AI is and what it can do, or if it misunderstands what cancer is and how medical research works.