Talk to your state university extension. They should know and answer.

Depends on how large the canker is. But at 30 years old, your cherry has reached the end of its projected life expectancy (not long lived trees for a whole host of reasons) so I would suggest removal.....cankers located in the trunk are very hard to contain.

And no, I would not use cuttings from this tree.

Thank you very much for the advice, I guess I'll try to have the tree removed. Thank you!