Is it correct?

Some diseases are cured

I'm not really sure that diseases have cures. I think that we have cures for them. So, I would say, "we don't have a cure for some diseases" or "there is no cure for some diseases".

Hi!

Acocording to the Oxford Collocation Dictionary you can say "to have a cure"

"If the disease is detected early, it has a cure"

I hope you will find this information useful

also you can say ( some diseases have no cure ) .

hi, some diseases do not have any cure