Posted 6/27/2015 8:45 AM (GMT -6)
Looks like they are.
A search for gene therapy pain brings up some relevant results at the clinical trials website. (Hope this URL leads right there, but if not, search for those words from the homepage.) https://clinicaltrials.gov/ct2/results?term=gene+therapy+pain&Search=Search
Many of the results are irrelevant, but some look like they are, like the upcoming trial: "Phase 3 Gene Therapy for Painful Diabetic Neuropathy," and a couple of the completed ones.