You should probably already be on some form of ADT to drive down testosterone to “castrate” levels <20. This is done to make the radiation more effective in the process of killing treated cancer cells. Most advocate this for 18 months to 3 years. But even 6 months is helpful and possibly sufficient if the pre RT PSA was low. Lupron and similar, or Firmagon are most often used for ADT. But topical estradiol can also work. Search for PATCH trial on this. Takes a lot of estradiol patches: wearing 4 at a time. Many MOs are not on board with this as not considered SOC, even though if T is castrate it is equivalent as ADT. Also, oncology practices make profits on Lupron injections, none for prescribing estradiol. Another consideration would be to use Lupron or similar ADT and then add estradiol in much lower dose to help or eliminate major adverse side effects while helping to preserve bone mineral density. This is much easier, only one 0.10 mg/day patch changed twice weekly or an equivalent dose of estradiol topical gel. Easier sell to the MO too. A good compromise. Tamoxifen 10 mg can prevent the otherwise inevitable gynecomastia.
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