BUZZ-Valeant shares stumble, but still set for big week
** U.S.-listed shares of Valeant Pharmaceuticals International fall as much as 4.9 pct on Friday morning before paring some losses
** Investor William Ackman says Valeant not selling Bausch & Lomb unit, and only considering selling non-core assets, CNBC reported late on Thursday
** Even with Friday's declines, Valeant shares still up more than 23 pct for week, set for biggest weekly percentage gain since Jan 2011
** Shares benefiting this week as drugmaker said lenders agreed to give company extra month to file annual report, while Ackman offered a more optimistic outlook for Valeant
** However, shares of embattled drugmaker still have lost two-thirds of their value this year, and are off 87 pct from their record high of $263.81 hit last August Chart: bit.ly/23oWezS
(Reporting by Lewis Krauskopf)
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