What Is The Life Expectancy In A Renal Cell Carcinoma Patient?

The doctor found a mass on my father's kidney a little over 5 years ago. My father refused to have a biopsy done. Now here we are 5 years later and my father was in the hospital about 2 weeks ago for continuous vomitting and atrial fibrillation. My father is 81 years old and has had 3 "mini strokes" that I know of since Jan 2010. Yesterday, the doctor diagnosed my father with renal cell carcinoma, but has yet to stage it. My father has been in the hospital twice in the last 2 weeks and discharged himself. My question is, if my father does not get treatment, aside from the inevitable, what can my family and I expect in the next few months? Thank you very much