The Stock Market is Baffling

I posted before about Genspera (GNSZ).  I think that it is a really interesting company with a compelling product.  Today (9/9/15) Genspera announced that their Phase II trials of their lead candidate drug shows promising results against not only liver cancer, but also brain cancer and solid mass cancerous tumors in general.  You'd think that would be a positive bit of news, right?  Apparently not, as the stock nosedived 25% in short order after the announcement.  Baffling.