Osiris Therapeutics, Inc. (OSIR), GlaxoSmithKline plc (ADR) (GSK), Forest Laboratories, Inc. (FRX): This Week in Biotech

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Finally, MannKind Corporation (NASDAQ:MNKD) delivered what looked like amazingly good news earlier this week, when it reported positive late-stage data on its inhaled insulin drug, afrezza. In both trials, according to MannKind, afrezza met its primary endpoint and delivered reduced A1C levels compared to the placebo. However, research firm Summer Street isn’t buying into the optimism, noting that MannKind only reported its results on two of its three late-stage trials while withholding the results from its Medtone-C trial. By week’s end, MannKind Corporation (NASDAQ:MNKD) has given up all of its big gains and actually ended lower by 23%.

The article This Week in Biotech originally appeared on Fool.com and is written by Sean Williams.

Fool contributor Sean Williams has no material interest in any companies mentioned in this article. You can follow him on CAPS under the screen name TMFUltraLong, track every pick he makes under the screen name TrackUltraLong, and check him out on Twitter, where he goes by the handle @TMFUltraLong.The Motley Fool recommends Gilead Sciences.

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