Does an oncologist only have to do prostate cancer to be an excellent PCa oncologist?

Uh...No.
Quite to the contrary it is a plus when their study of cancer is not limited to prostate cancer. In another thread John T posted:

Tony,
Try to do a search for Prostate Oncologists; they are very difficult to find. The PCRI use to have a list, but discontinued it. The only list I have found is on USTOO and contains less than 20 names.
I have bee treated by Urological Oncologists and they definately are not prostate specialists. Many medical oncologists treat prostate cancer, but don't specialize it in. I'm talking about oncologists that have prostate cancer as their speciality and only treat prostate cancer. I'm talking about oncologists that see hundreds of prostate cancer cases every year from diagnosis to treatment of advanced PC.
There are hundreds if not thousand of surgeons doing prostate cancer and any post from a city asking about surgeons wll result in 4 or 5 recommendations. Maybe you wll get 4 or 5 recommendations for a prostate oncologist across the entire US.
The Director of the PCRI told me that there were about 20 oncologists in the US specializing in PC. I spent 10 years seeing various doctors and only heard about prostate oncologists last year, and that was from my wife's oncologist, not from anyone in the PC industry.
JohnT

Tony,
I guess that we will have to agree to disagree. If you read Walsh's and Scardino's books and then read Myers' and Strum's books you wll see a vastly different philosphy in diagonosing and treating PC.
This I believe is a result of their training in completely different fields, even though they all specialize in PC.
The biggest differences I see are that the 1st choice of Walsh and Scardino are surgery wheras Strum and Myers look at surgery as only one option and usually not the 1st option of choice.
Diet and supplements are a large part of an oncologist's treatment recommendatons.
More emphasis is placed on treating the whole body, not just the PC part of it.
More emphasis on using imaging to stage the cancer. Myers and Strum routinely send their patients to get color doppler ultrasound and Combidex if there are any questionable stats. I know of no urologists or surgeons that have recommended their patients for these tests.
Myer's and Strum place more emphasis on PSA kenetics to see how the cancer is manifesting itself than Scardino and Walsh.
Oncologists are more familiar with the results of various treatments and their affects as a very large part of their practice is dealing with failed local treatments of all types. Failed surgeries are usually passed on to someone other than the surgeon who did the 1st treatment.
I would suggest that everyone read all four books and come to their own conclusions.
By the way, the current head of urological cancer at Anderson was the one who mis diagonosed me during the three years I was his patient.
I agree with you that many patients don't need an oncologist as their PC is fairly straighforward, but it's way more than 1%. If one is seeking a 2nd opinion for anything relating to PC, I would strongly recommend putting a prostate oncologist on your list as they will look at your PC differently and from a different angle than a surgeon or a radiologist. If we look at the PC stats and see that nearly 1,000,000 men have been over treated and 25% to 30% of all treatments result in reoccurrances then we have to admit that our current system is not very effective.
JohnT