Actress Maura Tierney is dropping out of the NBC series Parenthood, citing a scheduling conflict between the show’s production and her treatment for breast cancer, according to the Hollywood Reporter. The series, which is based on director Ron Howard’s 1989 comedy, was originally scheduled to premiere this month, but the shooting schedule was pushed back earlier this summer when the former ER star was diagnosed with breast cancer. The role will now be recast and the series is expected to launch after the February 2010 Winter Olympics.

In a statement, Tierney’s spokeswoman said, “Maura Tierney regrets that she will not be able to continue her role on Parenthood due to a conflict with the production schedule of the show and her breast cancer treatments. Ms. Tierney and her doctors remain confident that the outcome of her treatments will be positive. 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 [executive producer] Jason Katims and NBC for their patience and support.”

NBC added in a statement: “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. Our thoughts and best wishes are with her.”