Olivia Munn‘s mother is now battling breast cancer, a year after the 45-year-old star revealed her own cancer diagnosis.

“My mother was diagnosed with breast cancer,” she began in an Instagram post on Wednesday (July 9).

“You may know that when I talk about my own battle with cancer I bring up the Lifetime Risk Assessment test that saved my life. I never would’ve predicted it would save my mom’s life as well. ❤️”

Keep reading to find out more…

After learning she had breast cancer in 2023, Olivia urged her mom to take the Tyrer­-Cuzick breast cancer risk assessment. The free tool estimates a woman’s risk of developing invasive breast cancer within the next 10 years and within her lifetime, Dr. Thaïs Aliabadi explained, via People. A lifetime risk score of 20 percent or more suggests high risk, and additional diagnostic screening may be required.

Her mother scored 26.2% despite having a clear mammogram, so Olivia insisted that she get an MRI.

“Shortly after, my mother was diagnosed with stage 1 Her2 breast cancer. She has since completed 12 rounds of chemo and will continue monthly Herceptin transfusions until this fall,” she wrote.

“From my mom being there after my double mastectomy to me being there after hers. From me having to find an oncologist, to my mom and I sharing one. I can tell you this: going through cancer is really hard. But there’s something about watching a loved one go through it that is even more heartbreaking.”

“My mom’s husband , Sam and I learned everything we could about Her2, chemotherapy, immunotherapy, cold caps… I spent many nights taking care of my mom when the chemo became too much, wishing I could fight the fight for her, even if only for a day to give her a little break,” she continued.

“It’s no small feat to realize you can’t do it for them. To anyone out there who is taking care of someone or has made it their profession to do so, thank you. These gifts can feel near impossible without you.”

Olivia stressed that the breast cancer risk assessment test “saved my life and now my moms.”

“We’re taught about our periods, yearly Pap smears and mammograms at 40. And we now need every gynecologist to incorporate the lifetime risk rest into their care plan,” she wrote.

“All of these things matter, you can’t leave one off. My mom wanted me to tell you that she hopes by sharing her story it will help save someone’s life.”

“I want to say how proud I am of my mom,” she added. “She’s handled all of this with bravery and humor while still driving us crazy (just says after her double mastectomy she tried to do laundry and make dinner – she’s insane.)”

Find out what Olivia Munn recently said about her own treatment.