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The actress, who played Abby Lockhart in the medical drama, announced that she was leaving the upcoming series last September after discovering a tumour in her breast.
Speaking at the TCA Panel this weekend, producer Jason Katims said: "She's doing well… She's doing really good.
"She's in treatment and I spoke to her a few weeks ago and she's doing good."
Former Gilmore Girls star Lauren Graham was later confirmed as Tierney's replacement in the show, based on the 1989 movie starring Steve Martin and Keanu Reeves.
Parenthood premieres on March 1.
More: Maura Tierney, Showbiz
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