Hi Lingling,
I hope you can post your stats for us to see. At first glance, there appears to be a discrepancy between your stats and your conclusion that your cancer is local. According the the National Cancer Institute, stage IV prostate cancer has spread beyond the prostate itself:
National Cancer Institute said...
Stage IV
In stage IV, the PSA can be any level and the Gleason score can range from 2 to 10. Also, cancer:
has spread beyond the seminal vesicles to nearby tissue or organs, such as the rectum, bladder, or pelvic wall; or
may have spread to the seminal vesicles or to nearby tissue or organs, such as the rectum, bladder, or pelvic wall. Cancer has spread to nearby lymph nodes; or
has spread to distant parts of the body, which may include lymph nodes or bones. Prostate cancer often spreads to the bones.
I hope this was just a typo on your part. Regardless, as others have said, there is still great hope, so don't despair. Read, research and learn all you can.
Best wishes,
Nellie