Maura Tierney has left the NBC show Parenthood to undergo treatment for breast cancer.
Tierney, who revealed she had breast cancer in early July, has concluded that her cancer treatments will conflict with her filming schedule.
Tierney had filmed the pilot episode for the series, which was scheduled to premiere this month. But filming was delayed after a tumor was found in her breast, requiring surgery.
NBC have yet to announce a replacement for Tierney, who was slated to play Sarah Braverman in the rework of the 1989 Steve Martin comedy.