Jay Leno’s new show won’t be the only reason why NBC’s had to reshuffle this fall. A new series based on the 1998 movie Parenthood is now being delayed due to a medical situation.

On Friday, the network announced that the program was being pushed to midseason because of “medical evaluation” that actress Maura Tierney was undergoing. Although NBC could not elaborate on the situation, the execs revealed that production would be delayed eight weeks.

Today, the ER star chose to open up about the matter. “In an effort to guard my privacy, it seems that the wording of NBC’s press release has unfortunately caused some confusion and undue alarm about my health. I have discovered a tumor in my breast which requires surgery. I will not know either my exact diagnosis or course of treatment until that surgery is performed. My doctors have all assured me this is a very treatable condition. I’m very optimistic as to the outcome and want to thank everyone who has sent positive thoughts and support. I look forward to going back to work soon,” her statement read.

Parenthood - which also features Peter Krause, Erika Christensen, Dax Shepard, Craig T. Nelson and Bonnie Bedelia - was scheduled to debut on September 23. It’s believed medical drama Mercy will now take its place.