hi and welcome, unfortunately not for the reason that led you to our site..I'm so sorry about Harmony's diagnosis. VAS or vaccine associated sarcomas are terrible, we do what we've been told is right for our kitties and they end up with a terrible disease such as cancer.
I can't tell you what to do dear, that has to be your call after you do alot of reading. I will send you a site with info also encourage you to read our archives to see what the outcome has been for other pets with the same.
Unfortunately this type of sarcoma has a high instance of reoccurring and when it does it returns with a vengeance.
There is a very small likely hood that the Vet no matter how skilled will get 'all' the tumor.
And after a year its very likely already spread, IMO the not eating is an indication of pain.
I'm so sorry to have to tell you all this bad news.
This is just my own opinion from the reading I've done by other owners. I would myself probably never put one of my own kitties through all the surgery and chemo, but you do what you feel is right for you and in Harmony's best interests. I can feel the love in your letter, she's been well loved for 13 good years. My heart goes out to you both. Please post again anytime.(((♥)))
http://www.vin.com/VINDBPub/SearchPB/Proceedings/PR05000/PR00389.htm
and here is some reading on a old thread from other owners...you can try sending a private message to some of them, most are no longer active members but may still reply to a private message for updates....hope this helps some♥
http://www.medhelp.org/posts/Cats/fibrosarcoma/show/395079