Maura Tierney has pulled out of NBC's upcoming drama series Parenthood because of a scheduling conflict between the show's production and her breast cancer treatments.

NBC has begun the process of recasting her role in the project based on the 1980s movie, written and executive produced by Jason Katims.

Ms. Tierney and her doctors remain confident that the outcome of her treatments will be positive, Tierney's spokeswoman said Thursday. She is deeply disappointed that she will not be able to rejoin such a highly respected, talented, fun and funny group of actors and wishes to thank (writer/executive producer) Jason Katims and NBC for their patience and support.

Parenthood, in which the 44-year-old actress plays one of the central characters, was originally slated to premiere this month but was pushed to midseason in July when, shortly before the series was to go into production, Tierney's doctors discovered a tumor in her breast.

At the time, production start date was postponed until November to give Tierney time to undergo the necessary medical procedures. It now appears Tierney's treatment will take longer, leading to NBC's decision to recast the role in order to make the midseason launch date.

While we are saddened that Maura Tierney won't be able to continue in her current role in 'Parenthood,' our main concern is for her quick and full recovery, an NBC spokesman said. Our thoughts and best wishes are with her.

TV Cancer