I'm new here and have a question. My uncle was diagnosed with prostate cancer over 10 years ago. He chose not to treat it. It appears that the cancer has spread, but I'm not 100% sure. He is very elderly. about a month ago he began having severe pain in his pelvic/lower back area. The pain was so intense that we had to take him to the ER. They did a CAT scan and it showed "multiple fractures to the sacrum." The doctors said that that is what typically happens when prostate cancer spreads to the bone. He is now in hospice care and very weak. However, I would like to know conclusively if that is what has happened. Two years ago his PSA level was at 9. They are going to run another PSA test and they said if it is elevated from the 9 where it was 2 years ago then we will know for sure that the cancer has spread to the bone. My question is (1) is that statement correct, and (2) what "magic number" tells us that the cancer has spread? Thank you for your help.