After an incredible week that saw shares of Peregrine Pharmaceuticals (NASDAQ:PPHM) appreciate a surprising 80% on Monday, shares of this biotech took a 10% haircut today. Why the drop? In this video, health care analyst Max Macaluso discusses today's decline and offers his opinion of what investors should watch in the coming weeks.

Max Macaluso, Ph.D. has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.