BUZZ-Valeant Pharmaceuticals International Inc: Shares volatile
** Canadian drugmaker's U.S.-listed shares oscillate during conference call; down 2 pct at $83.50 premarket after rising 1 pct
** Company is updating investors on business operations
** Says Philidor, the controversial specialty pharmacy used by Valeant, will cease operations by end-January
** Valeant YTD share performance : link.reuters.com/rup85w
** Up to Monday's close, stock had fallen about 45 pct since Citron published report accusing Valeant using specialty pharmacies to inflate revenue
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