Iris, there's not much I can add but wanted to chime in and welcome you to Healing Well. We are all sorry to hear about
your dad's diagnosis and about
your own anxiety and fear. These are natural feelings and I think it is safe to say that everyone on this forum has been there albeit in different roles (my husband was diagnosed 2.5 years ago with a Gleason 3+4 and he also had two biopsies before the cancer was found).
I noticed that your dad's biopsy showed that 6 out of 6 cores were positive which indicates that the doctor took only 6 samples. This is a small sample to take...generally, 10, 12 or even more samples are taken during the biopsy. Of course, this is a moot point since your dad's biopsy already confirmed PCa with 100% of the samples taken positive.
By any chance do you have a copy of the biopsy report? While the number of positive cores is important, it's also critical to know what percentage of each core showed cancer cells. Obviously, the higher the percentage the more extensive the disease. The report should provide this information and, if you don't already have a print out of it, I would certainly suggest that you get it. Other information on the biopsy might include whether or not perineural invasion was noted (this is a common finding).
Your dad is very lucky to have you helping him through this. Good for you that you're trying to get appointments at Sloan Kettering...you really can't do much better than them. Another option that we considered (we live in the NYC area) is Columbia Presbyterian...they have an excellent cancer center and are a bit more flexible in terms of insurance coverage than Sloan Kettering.
There is much you will learn over the next few weeks about prostate cancer. If your dad decides that surgery is his treatment of choice, he'll have to wait for the prostate to heal from the biopsy before the surgery can be done. I seem to remember something like 6 or 8 weeks between biopsy and surgery is the minimum time to wait but the surgeon will guide you as to timing.
The one thing I have learned in our PCa journey is that there is no one-size-fits-all protocol for this disease. While the doctor felt there was a chance that the cancer has escaped the prostate, this does not mean that surgery (or radiation, for that matter) will not work. My husband's cancer after surgery was upgraded to stage IIIa because he had what is called extraprostectic extension (the cancer had invaded the capsule) but, 2.5 years later, his PSA remains at undetectable which means that the surgery has been successful. None of us knows what the future holds, but we learn to be grateful for every piece of good news.
Come back and let us know how things are going.