You get care that is covered, there might still be some drugs and experimental treatments that isn't. This is because there's still no actual cure for cancer.

This is why you still can see people collecting money for treatments even when they have socialized medical care.

When your cancer can be treated with already approved treatments then you are golden otherwise you do suffer similarly.

This is not attack on socialized medical care, you are still better than no care, you might still get radiation, chemotherapy etc, it is more attack on situation cancer can create.