Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga August 17, 2015 at 08:18 AM EDT Onconova Therapeutics Inc (NASDAQ: ONTX) fell 8.23 percent to $2.23 in pre-market trading after jumping 22.73 percent on Friday. ... Read More >> Related Stocks: Aquinox Pharmaceutic Cisco Systems Estee Lauder Co Perrigo