GRI Bio Inc.’s oral version of tazarotene is showing phase IIa promise in idiopathic pulmonary fibrosis (IPF). The peek at interim safety with the compound, a RAR-βɣ dual agonist designed to inhibit the activity of human type 1 invariant natural killer T cells, consisted of a preplanned analysis of two-week results in the biomarker study. GRI-0621 at 4.5 mg once daily proved safe and well-tolerated in the first 12 patients.