Hi Dogbot, - Cysts are usually harmless, as long as they remain cysts, which are usually encased fluid. Having had an untreated PSA topping 1,000 and A Gleason 10, he should be followed closely, because he undoubtedly has systemic disease, for which he is now being appropriately treated.
It should be understood, however, that Hormone Therapy (HT) is not a "cure" for such advanced Cancer. The treatment goal has likely changed from attempts to "cure" to one of attempting to "control" the malignancy by slowing the advance of what will now be treated as an incurable, "chronic" disease.
In the best case scenario, he MAY have temporary remission but, historically, the PCa eventually overwhelms the effectiveness of HT, a phase called Hormone Refractory. The time it takes for the patient to get to such an unrelenting advanced status varies WIDELY by individual patient, but is usually measured in years, rather than months.
His response to HT has been immediate and encouraging, indicating that most cells are presently hormone sensitive. With continued good fortune, he could enjoy a prolonged period of control, but only time will tell how soon these cells will mutate to "unsensitive' status and other approaches are necessay.
Hope this helps the understanding and I wish the best luck and care, to your friend and to you. -
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