Sienna loses a quarter of its value over pivotal trial failureSienna Biopharmaceuticals said on Monday (30th July) that two pivotal trials of its main experimental acne treatment did Share XSienna loses a quarter of its value over pivotal trial failurehttps://pharmaphorum.com/news/sienna-loses-a-quarter-of-its-value-over-phase-3-trial-failure/