I chose IMRT as my primary treatment. My PSA history is in my signature. I was told by my oncologist prior to treatment that anything less than a 1.00 after radiation was considered a success. I have also found this reference in some medical articles online. There is most likely some viable prostate tissue and it will produce PSA. As I understood it the normal cells can recover better than the cancerous cells after radiation. The DNA of the cancerous cells apparently suffer more damage from radiation. Thus there may be no or little volume in the way of canerous cells but some normal cells survive.
Also, as Steve noted, any test has varition in it. I am a process engineer and work daily with processes and statistical control. I won't attempt a lesson in this but suffice it to say that there is "normal variation" in any measurment. Depending on the test it can be very low or very high in some cases. The .05 increase is 11% variation. Ask your doctor what the normal variation is for the test.
The "bump" typically occurs within the first two to three years after treatment. I suppose it could happen this far out but have doubts. If the increase has only been .05 after 40+ years I would agree with your doctor. Relax.
Best to you and your husband.
Diagnosed 04/10/08 Age 58 at the time
Gleason 4 + 3
DRE palpable tumor on left side
100% of 12 cores positive for PCa range 35% to 85%
Bone scan clear and chest x ray clear
CT scan shows potential lymph node involvement in pelvic region
Started Casodex on May 2 and stopped on June 1, 2008
Lupron injection on May 15 and every four months for next two years
Started IMRT/IGRT on July 10, 2008. 45 treatments scheduled
First 25 to be full pelvic for a total dose of 45 Gray to lymph nodes.
Last 20 to prostate only. Total dose to prostate 81 Gray.
Completed IMRT/IGRT 09/11/08.
PSA 02/08 21.5 at diagnosis
PSA 07/08 .82 after 8 wks of hormones
PSA 10/08 .642 one month after completion of IMRT, 6 months hormone
PSA 03/09 .38 six months post radiation and nine months into hormones
PSA 06/09 .36 or .30 depending on who did the test
PSA 09/09 .33 one year after IMRT and 16 months into hormone