There are many laws of physics that say that cures for cancer- general ones that treat a wide array of cancers and are effectively permanent with no reoccurrence- are a long time away. Cancer is subtle. Cancer is wily. Cancer is tightly integrated with our eukaryotic nature.

AI was decades away, for decades! It took a wide range of conditions to be satisfied before it became clear it was a powerful tool.

Also, medical people rarely use the term "cure cancer", as we have too much experience with recurrence of the "same" cancer (not just in the same location, but a genetic descendent of the original cancer).