It is incredible, but makes to wonder how many things are possible that we don't do.
I also keep thinking about the book childhood's end, where aliens land and basically force us to run our things properly, cleaning up the planet's problems in a matter of a few years. I always wonder if we got put to the challenge as a species, whether we could meet it.
Let's not assume that nobody else knows what they are doing.
They know what they are doing all right. For instance, ITER's managerial staff surely enjoys the jet-setting between Barcelona and the French Riviera. But their goals are not aligned with making progress.
That said we do have good treatments for the vast majority of forms of cancer, the problem is that your survivability is directly tied to how early it's detected, surgical removal, radiation and more notably modern chemo regiments are very effective in early stages of detection.
Many type of cancer today have 90%+ survivability rates if they are detected early enough, detection isn't always easy allot of them can not turn symptomatic till later stages, and many of them won't show up in blood work / body scans clearly either.