I had a port for my chemo and kept it for the blood tests. I had to go to the doctor's or the hospital chemo suite to get blood drawn from the port, which was a nuisance, but it was worth it. Maybe that's a possibility for your wife.
I think, if your wife will face each battle as it comes along and focus just on the immediate situation, she'll be able to do more "rounds" than you think. I wish her -- and you -- all the best.
I think there are some women that successfully beat the beast, depending on their initial diagnosis and staging. But as with any cancer, the usual time is 5 years cancer free before being declared "cured." Many women do go on for years dealing with remissions and reoccurrences. I have a friend that has been off and on chemo for over 8 years now and her last scan was clear. How exciting is that? She's active and happy and travels. Is she considered cured? Not yet but we're happy for the moment, the day, the month.