Cymabay Therapeutics Inc.'s chief scientific officer, Charles McWherter, told BioWorld that the concept of liver enzyme scores as a powerful indicator of efficacy vs. liver fat reductions in nonalcoholic steatohepatitis (NASH) "is not an entirely made-up idea, just because we got this result" in the phase IIb study of peroxisome proliferator-activated receptor (PPAR) delta agonist seladelpar. "If you had to choose between reducing fat, which can be harmful or can be inert, or showing evidence of improving the underlying lesions and injury" as a way of showing a drug's worth in NASH, he said, researchers might choose the latter as "more proximal to the injury," McWherter said. As Newark, Calif.-based Cymabay's chief medical officer, Pol Boudes, put it, "the fat story is not the end of the story" in NASH.