US STOCKS-Nasdaq has worst day since June 2012, weighed again by biotechs By: Reuters: Company News April 10, 2014 at 14:19 PM EDT * Indexes off: Dow 1.2 pct, S&P 1.6 pct, Nasdaq 2.7 pct (Updates to afternoon trading) Read More >> Related Stocks: Adamas Pharma Alexion Pharmaceuticals Ally Financial Fireeye Inc