Suggest Treatment For Renal Cell Carcinoma

Hello, My father recently had an mri which showed several tumors in his spine which cause spinal compression after extreme back pain and loss of leg/foot sensation. They performed a spinal decompression surgery and removed several tumors. They said his spine looked like swiss cheese. The biopsy of the tumor came back as a plasma cell neoplasia. A week later, they did a bone marrow biopsy and when that returned there was no sign of multiple myeloma in the marrow. There are lesions in his kidney, ribs, spine and liver. They did a biopsy of the kidney and that lesion came back as renal cell carcinoma. They told my father they have never seen anything like it before. We could use any information you can give. They will be doing a biopsy of the rib tumor next week to determine what that is. Any thoughts?? He has several broken ribs due to the tumors on his ribs that is causing extreme pain and he is on pain patches for that and also morphine.