Dendreon (NASDAQ:DNDN) is a constant target for short-sellers, with shares down by a third for 2012 and the two-year graph looking even worse. But with a very important clinical trial on the way for Dendreon's Provenge in sequence with Johnson & Johnson's (NYSE:JNJ) drug Zytiga in a pre-chemo cancer indication, is the short-selling over? Motley Fool health care analyst David Williamson tells us why the shorts might be wrong on this one and why Dendreon might be due for a turnaround.

David Williamson has no positions in the stocks mentioned above. Follow him on Twitter @MotleyDavidBrenton Flynn has no positions in the stocks mentioned above. The Motley Fool owns shares of Dendreon and Johnson & Johnson. Motley Fool newsletter services recommend Johnson & Johnson. 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.