Joanne, I think the longest I've heard of is l6 years cancer free and then it came back. I'm sorry to hear it has, but would seek to reassure you that cancer treatment for secondary cancer has moved on immensely since you first had RCC eleven years ago.
Not only are there a range of sophisticated techniques such as cyber knife radiation and cryoablation etc, there are also a raft of new powerful drugs as well. So things are a lot brighter than they used to be,.
Your experience is a sobering reminder that once you have cancer, any 'cure' may always be temporary, and vigilence is always required. It sounds like you have caught this 'Return of the Beast' at a much earlier stage than often happens, and I wish you all the best for whatever treatment you go for. Do read up as much as you can, to catch up with the latest possibilities.
As you will doubtless remember from the first time around, it's very important to have an oncologist who is an RCC specialist, as it's a cancer that has its own requirements.
Finally, you might like to join kidney-onc mailing list, which has a treasure trove of information and experience, and which I have found invaluable in respect of my husbands Stage IV RCC. You can join on (whoops, sorry, I'm on the wrong computer - I'll have to post the contact details later, though you can find them in earlier posts here).
All the very best, and hope your consutlation goes positively.
Julie