Hi Sammyswife,
Forgive me as I can't answer all of your questions, but I am sure that other more knowledgable guys will respond to you in due course.
As I understand it PSA is reckoned to be a very good tool, for doctors to use once you have been diagnosed, they can monitor the progression of the cancer, and check how well their medications and treatments are working.
Where PSA is far more hit and miss is when it's used to diagnose cancer in the first place, lots of guys with high PSA's go through the fun of a TRUS biopsy only to be told that there is no sign of cancer. Others have low PSA scores, no obvious symptoms and suddenly find themselves with advanced prostate cancer. The American doctor who discovered PSA, a Dr Ablin, was on TV last month describing PSA monitoring as a public health disaster, if you check out on the Internet he has written that tossing a coin is as useful as a PSA test in determining who has cancer.
Hopefully it helps you and your husband to know that it doesn't really matter how often you have PSA tests prior to diagnosis, so there is nothing you could have done to prevent things developing the way they have.
I guess you are fairly devastated if the diagnosis is only recent, but take heart lots of us survive many years with prostate cancer, we have fun in our lives, we try to remain upbeat, the philosophy is 'I've got cancer, but cancer hasn't got me'.
A very good cure for prostate cancer, at this time of year, is a holiday, somewhere warm and sunny, so your other half can get lots of vitamin D, have a few beers and enjoy a curry, they are all good anti-cancer remedies.
:)
Dave