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I actually was in this trial! Sadly, only some improvement. Weighing a new trial with direct injection of donor stem cells vs. Martius surgery right now (as we wait for trial to be approved to move forward).
I believe they may be pursuing trials for both, but I'm not sure. Rectal fistulas tend to have better success rates with intervention than RVF, I believe, and other trials have started with rectal, so hopefully for you and others.