May I suggest a thorough check to ensure they move to a treatment course they are more convinced by? Extra investigations really hint at leaving no stone unturned. It sounds like your wife is in good hands.
Frightening news @US Seagull and you have my best wishes.
Sadly, there is a lot of it about. My mum was treated surgically and is well past her 5 year check.
The best advice I can give you is try to respond to what you know, not what you fear Easy to say but try not to let the worst case...