If your father is stage IV and there is no cancer in his bones, brain or lungs(most common places for kidney cancer to go), where are his mets? What type of kidney cancer does he have?
Michael Atkins at Beth Israel in Boston is an oncologist who has lots of exprience treating kidney cancer that has spread beyond the kidney.
There is an email support group specific to kidney cancer. See
http://cancerguide.org/kofaq/.