BUZZ-Summit Therapeutics: Best day since 2009 on Sarepta deal
** Shares (Berlin: DI6.BE - news) in drug developer Summit Therapeutics (NasdaqGM: SMMT - news) up 58 pct after teams up with US drug co Sarepta Therapeutics (Xetra: AB3A.DE - news) to develop and market DMD drug in Europe
** Stock poised for its best day since April 2009
** Co gets $40 mln upfront payment, could receive up to $522 million in milestone payments
** Trading in Sarepta and US-listed shares of Summit halted pre-market
(RM (LSE: RM.L - news) : rahul.b.thomsonreuters.com@reuters.net)