I also have mucin producing urothelial adenocarcinoma of prostate. Diagnosed last February although due to the rarity it took bone scans and pet scans and multiple path labs to confirm. I had 2 months of FOLFOX chemo which brought my CEA down some but didn’t do much to shrink tumors. ( I was stage 4 with Mets to spine, peritonium, lymph nodes and seminal vesicles). Got full genetic testing of tumor and it scored PDL-1 100 so we started Keytruda and Ivermectin. I dose the Ivermectin at 0.4mg/kg on three sequential days each week. It greatly increases the response to Keytruda. After 6 week my CEA was down to normal (2.8) and CT scan at 10 weeks showed the Mets had disappeared and prostate tumor was 1/3 the volume from initial diagnosis. Urological symptoms largely disappeared. As of now, CEA has slowly climbed to 6.2 and symptoms are slowly retuning so seeing urologist tomorrow. I also take capecitabine (Xeloda) one week on one week off, quercetin with bromalin, Lycopene and Curcumin. Those nutraceuticals can only be used with nonoxidizing chemo. Please let me know how things are going and certainly get the genetic testing.’