Questoins about possible vaccine derived from cells of extracted RCC tumor

Does anyone have info regarding what needs to be held on to, in order for possibly a future vaccine to treat RCC? I've ran across a few things, but want to find out how one goes about retaining a piece of the tumor for this potential research. I have a call in to my Urologist, but I'm being told that the hospital still may be storing something from my partial neph.

I'd like to hear back from someone who has looked in to this potential path.