I'm trying to understand your note. When you say cancer was found in December 2014, I assume you mean December 2013. I also assume it was prostate cancer and that it was found when you had a biopsy. After a biopsy, there's usually a meeting with the urologist, where the results of the biopsy are discussed: generally, the patient is told how many cores were taken, how many were positive for cancer, what the Gleason score was in the cores found positive for cancer, and what the urologist recommends in terms of treatment.
The doctor may advise surgery or some other form of treatment, such as external beam radiation. I assume you considered various approaches but decided on surgery, which was then followed up 3 months later with an office visit, a PSA test, and that your PSA level was then found to be zero, or undetectable, which is the ideal outcome of surgery.
I'm not sure why the doctor would send you to Oncology at this point. All you have to do is go to his office and request a copy of your surgical pathology report and have it explained to you. It will tell you exactly what the pathologist(s) found when your surgically removed prostate gland was dissected and examined. It will specify the size of the prostate, and exactly where cancer was found in the gland, plus whether the cancer was Gleason 6, 7, 8, or 9, which will tell you how aggressive the cancer might have been.
I think you really need to call your urologist and ask for an office visit to have your situation explained to you in detail. But, if your PSA at 3 months after surgery was found to be zero, I would say things have turned out quite well for you.