External radiation therapy to the prostate is completed as 4-field conformal (organ configured) radiation therapy.
Conformal radiation therapy distinguishes itself from conventional radiation therapy by delivering a higher dose toward a reduced target volume. This provides a reduced toxicity to the neighboring structures (rectum, bladder, nerves).
It can be appropriate to give hormone treatment in addition to radiation treatment in patients where:
- Volume of the prostate is great (> 60 cc)
- The tumor has grown through the capsule (T3) and/or PSA > 20 and/or Gleason score ≥ 8
- T1/T2 pN0, PSA ≤ 20
- T1/T2 pN0, Gleasonscore ≥ 8
- T2 pN0, 20 < PSA < 70
- T3 pN0, PSA < 70