On Wednesday, the actress — who publicly revealed in March 2024 that she was identified with luminal B breast most cancers in April 2023 — opened up about her mother Kim’s analysis in an Instagram put up, sharing that she was identified with Stage 1 Her2 breast most cancers and has accomplished 12 rounds of chemotherapy.

Munn, 45, recalled that she urged her mother to take a Lifetime Threat Evaluation take a look at after it had in the end led to her personal analysis.

“My mom was identified with breast most cancers. You might know that once I discuss my very own battle with most cancers I deliver up the Lifetime Threat Evaluation take a look at that saved my life. I by no means would’ve predicted it might save my mother’s life as properly. ,” Munn, 45, wrote within the caption of her put up.

The mother of two detailed Kim’s breast most cancers journey in an announcement.

“After my very own breast most cancers analysis in 2023, I urged my mom and sister to take the Breast Most cancers Lifetime Threat Evaluation Take a look at,” Munn started. “My mom scored 26.2%. Her yearly mammogram head simply come out clear however due to that top rating I insisted she get an MRI.”

“Shortly after that MRI, my mom was identified with Stage 1 Her2 breast most cancers,” she continued. “She has since accomplished 12 rounds of chemo and we’ll proceed month-to-month Herceptin transfusions till this fall.”

Munn — who underwent a double mastectomy in Might 2023, a month after her analysis — went on to recall being on her breast most cancers journey alongside her mom.

“From my mother being there after my double mastectomy to me being there after hers,” she mentioned. “From me having to seek out an oncologist, to my mother and I sharing one. I can let you know this: going by way of most cancers is de facto onerous. However there’s one thing about watching a liked one undergo it that’s much more heartbreaking.”

The Newsroom alum shared that she and Kim’s husband, Sam, “discovered the whole lot we might about Her2,” together with chemotherapy, immunotherapy, and chilly caps.

“I spent many nights caring for my mother when the chemo grew to become an excessive amount of, wishing I might battle the battle for her, even when just for a day to offer her just a little break,” she wrote. “It is no small feat to understand you’ll be able to’t do it for them. To anybody on the market who’s caring for somebody or has made it their occupation to take action, thanks. These fights can really feel close to not possible with out you.”

Munn reiterated the significance of taking the Tyrer-Cuzick Threat Evaluation Take a look at, writing that it “saved my life and now my mother’s.”

After sharing statistics in regards to the take a look at, she mentioned that her mother “wished me to let you know that she hopes by sharing her story it’ll assist save somebody’s life.”

Munn concluded her put up by praising her mom, writing, “I wish to say how proud I’m of my mother. She’s dealt with all of this with bravery and humor whereas nonetheless driving us loopy (simply days after her double mastectomy she tried to do laundry and make dinner – she’s simply insane.)

She additionally thanked the docs and medical crew who took care of her mom.

In her put up, Your Pals & Neighbors star — who shares son Malcolm, 3, and daughter Méi, 9 months, with husband John Mulaney — shared a collection of photographs and movies documenting Kim’s most cancers journey, together with a candy video of Mulaney watching TV along with his mother-in-law, a clip of Kim ringing the bell marking the tip of her chemo therapy, and an lovable photograph of Kim together with her granddaughter, Méi.