It is VERY confusing. When people say "stage four" of any kind of cancer, they are usually referring to the AJCC Prognostic Group Stage IV (note roman numeral), which means metastases
have been detected (either pelvic LN (stage N1) or other (stage M1)). AJCC Prognostic Stage Group is actually an overall risk category. The risk categorization scheme most often used for prostate cancer are the NCCN risk categories (low risk, intermediate risk and high risk - with some sub-categories).
The "T" stage is just one of several risk factors used to assess the overall risk category. It gets confusing because stage T4 (note arabic numeral) means that tumors have grown into adjacent structures but are still tied to the prostate (i.e., they are not distant metastases).
Allen - not an MD
•PSA=7.3, prostate volume=55cc, 8/17 cores G6 5-35% involvement
•SBRT 9 yr onc. results
•SBRT 7 yr QOL results
•treated 10/2010 at age 57 at UCLA,PSA now: 0.1,no lasting urinary, rectal or sexual SEsmy PC blog