External beam RT is easily available locally. The treatment takes less than 5 minute 5 days a week and usually lasts 4 or 5 weeks. The only guys who chose seeds lived too far away to drive every day so chose seed for convenience. Two of the three had recurrence of PSA levels are are both currently at Lahey getting second opinions. The third guy is going okay so far, but has had a funny year with buring urine, low grade fevers and maiaise.
One excellent way to approach the problem is this:
start getting a PSA around 50 years old. Note the number. Look at the year over year change. If the PSA starts to double every year, that's a suspious sign. If it soars about 4 and appears to double and your doctor can prove to you that its not due to prostatis a biopsy should be done. If the biopsy shows cancer you will get a "GLEASON" score which stages the degree of tumor aggression. There is a formula that comprises PSA and Gleason score that can point you towards either external beam plus/minus hormone suppression. Or, as stated earlier, robot surgery if you are young and concerned about possible ED post treatment.
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On the other hand, I have six friends who have gone the seed route 1-3 years ago, including one (the oldest) who first had 5 weeks of radiation treatment. PSAs in all cases are still zilch. However, the one that had both radiation and seeds also experienced side issues believed to be caused by the radiation that have still not clearing up but have diminished to some extent.
Bill