Was it a PET/
CT that would show size increase? Are tumor markers relevant in your case?
Could investigate:
http://professional.cancerconsultant....aspx?id=43054
http://www.mbcnetwork.org/blog/?p=167
http://www.renalandurologynews.com/D...rticle/136212/
Since approved for renal cancer, maybe off-label use?
ASCO is coming up...