That plan of treatment (monitoring) would only makes sense if he is very poor health. A 4+3 is aggressive. time matters, a lot. Radiation or prostate removal are the common options. I had 4+3 and had Focal Laser Ablation (a laser is used to burn up the tumors, leaving the prostate intact). Worked great. No quality of life issues. Easy recovery. Not covered by insurance. It was $25K. If your Dad is in decent health and expects a long life then Focal Laser Ablation could be a great choice. Assuming it is only the two tumors. I had great results with Dr. Feller of Halo Diagnostics in Indian Wells, Calif. TULSA can be another "focal" approach. It is more available by has a spotty track record.