I can easily imagine a doctor put in a tough spot whilst deciding to treat a possible early stage cancer. If he gets it wrong a malpractice lawsuit is surely to ensue.
I really hope we live to see a future where physicians have less noisy data to work with, especially regarding early detection.
What if early detection failures at scale lead to better medicine? What if more patients lead to more science?
Resigning to, "fuck it, we aren't there yet" seems overly defeatist.
Between "no cancer" and "definitely cancer", there will be a gray field of "maybe cancers" and doctors will feel the psychological push to "do something" about them. Overmedication can kill as well, and it can definitely injure. There is a reason why doctors are reminded of the ancient "First, do not harm" maxim during their training - it is still valid.
I am not yet convinced that this is going to be a problem, but I don't want to ignore this scenario either.