I was diagnosed with Stage 4 M1b prostate cancer nearly 4 years with a Gleason score of 9 and a PSA doubling time of 2 months. My prostate and seminal vesicles were removed 3 years ago. I have gone through Lupron, Zytiga, and Xtandi. I take Xgeva for the bone metastases and for the last 18 months they do not show up on bone scans nor do I have any bone pain. About a month ago, I had a PET scan specific for prostate cancer performed. The PET scan results showed that I have 3 cancerous lymph nodes but did not show any other metastases. Given the above, my oncologist and radiation oncologist have decided to use IMRT on the 3 cancerous lymph nodes. Question: Are there any good articles or other info that give a good explanation for how IMRT can target the 3 separate lymph nodes but miss the tissue in between them? Thanks.