I think that - medically - it can be used or at least tried.
However there was a NHS guideline to say that once one of the drugs was used, the patient is not eligible for the other ( no doubt due to costs).
You would need to ask your consultant.
I have not heard anything about this for a while - perhaps another member can update me if I'm wrong.
I'm sorry that this is not the news you want to hear.
Alison