I don't know where you are located in the U.S. but there is an awesome kidney cancer oncologist in Las Vegas Nev. He is Wolfram Samlowski at the Nevada Cancer Institute. I hope you can get to him. I drive my husband 7 hours to see him every 2 months. It is difficult as he has mets to his spine and the car ride is painful but the trip is worth it. Pray and may God bless you and your mother.
Diane