NEW YORK, Sept 30 (Reuters) - A federal judge said Amgen ( AMGN )

must face a proposed class action accusing the

drugmaker of waiting too long to tell shareholders it might owe

the Internal Revenue Service $10.7 billion in taxes and

penalties.

U.S. District Judge John Cronan in Manhattan ruled on Monday

that shareholders plausibly alleged they were misled by Amgen's ( AMGN )

concealing the true extent of its potential liability, and that

the omission was "reckless" under the circumstances.