Maura Tierney drops out of 'Parenthood'

September 10, 2009 Maura Tierney has pulled out of NBC's upcoming drama series "Parenthood" because its production schedule would interfere with her breast cancer treatments. NBC has begun the process of recasting her role in the project based on the 1989 movie that's written and executive produced by Jason Katims. "Parenthood," in which Tierney was to play one of the central characters alongside Peter Krause, Erika Christensen, Dax Shepard, Bonnie Bedelia and Craig T. Nelson, originally was slated to premiere this month but was pushed to midseason in July when, shortly before the series was to enter production, Tierney's doctors discovered a tumor in her breast.

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