Europe seen cautious on central bank policy; US data eyed By: CNBC.com News April 30, 2014 at 01:05 AM EDT European shares are set for a lower open as concerns over central bank policy are set to outweigh any bullishness on the current earnings season. Read More >> Related Stocks: Alstom S.A. General Electric Gsk Plc ADR Royal Dutch Shell Cl B ADR Totalenergies Se ADR Twitter, Inc.