Mirena IUD Breast Cancer Risk Results in Class Action Lawsuit Against Bayer

On top of previous problems with the birth control implant, such as organ perforation, Bayer now faces claims of Mirena IUD breast cancer risks.

Bayer faces a class action lawsuit that alleges women face an increased risk of breast cancer from the Mirena IUD birth control implant.

The complaint (PDF) was filed by Priya Sidhu on March 14 in the U.S. District Court for the Northern District of California, seeking class action status to pursue damages for women who received the device.

The Mirena IUD is a small, t-shaped device that is placed into the uterus to provide long-term protection against pregnancy for up to five years. The polyethylene frame contains a steroid reservoir that releases levonorgestrel, which is a second generation progestin.

According to Sidhu’s lawsuit, side effects of the Mirena IUD cause some women to develop breast cancer, indicating that she never would have agreed to have the birth control implanted if information about the risks were had been shared with patients or the medical community.

“Plaintiff and Class Members relied on Defendant’s representations concerning the Product, including Defendant’s specific enumeration of risks that the Product carried,” the lawsuit states. “Plaintiff and Class members would not have purchased the Product— or, at minimum, would have paid significantly less for the Product—had Defendant disclosed that the Product carried with it a significantly elevated risk of breast cancer.”

The lawsuit claims Bayer knew about the increased breast cancer risks for years; since studies dating back to at least 2010. More recently, in 2014, Finnish researchers published a study in Obstetrics & Gynecology which found that women who receive the Mirena IUD to treat heavy periods may face a greater risk of breast cancer.

The researchers saw a nearly 20% increase in the risk of breast cancer with levonorgestrel IUDs.

Mirena is the best selling IUD in the United States. However, only a few variations of the long-term birth control implants are on the market, including Mirena and Skyla, as well as the ParaGard, which does not release levonorgestrel.

In prior years, Bayer has already faced thousands of Mirena IUD lawsuits over various problems with the implant, involving allegations that the drug maker failed to adequately warn about potential side effects of the IUD birth control. Most of the cases involve women who suffered severe internal injuries after Mirena IUD migrated out of place, resulting in perforations of the uterus and other complications.

13 Comments

  • AmelliaJuly 12, 2022 at 10:11 pm

    I'm 49 years old and had used the Mirena IUD for heavy bleeding and pre-menopausal symptoms for nearly 12 years before being diagnosed with invasive ductal carcinoma (HR+, HER2-). No family history of breast cancer and genetic testing came back negative. My oncologist explained that my cancer is strictly fed by hormones. I've undergone a complete mastectomy on my right breast and had to have 13 ly[Show More]I'm 49 years old and had used the Mirena IUD for heavy bleeding and pre-menopausal symptoms for nearly 12 years before being diagnosed with invasive ductal carcinoma (HR+, HER2-). No family history of breast cancer and genetic testing came back negative. My oncologist explained that my cancer is strictly fed by hormones. I've undergone a complete mastectomy on my right breast and had to have 13 lymph nodes removed. I'm now facing chemo, radiation, and hormone blocking meds for years. This has been devastating for me and my family.

  • BinaJuly 12, 2022 at 4:26 pm

    I developed breast cancer after using Mirena for 5 years. I had the cancer lump removed followed by radiation therapy.

  • amyJuly 1, 2022 at 4:09 pm

    The mirena iud gave me beast cancer also.I had to have my breast removed.

  • JenniferJune 30, 2022 at 4:32 am

    My friend, 42, had the mirena for over ten years. Noticed a lump in her breast and was told she had stage 3 cancer cause it spread to lymph nodes. Three doctors told her it was because of a hormone in her iud. But they didn’t take it out until a month after her original stage three diagnosis. She was supposed to start chemo last week but after the drs got her pet scan they found out it has spread [Show More]My friend, 42, had the mirena for over ten years. Noticed a lump in her breast and was told she had stage 3 cancer cause it spread to lymph nodes. Three doctors told her it was because of a hormone in her iud. But they didn’t take it out until a month after her original stage three diagnosis. She was supposed to start chemo last week but after the drs got her pet scan they found out it has spread throughout her skeletal system, (spine, sternum, hips and more), and told her they won’t be doing any treatment or surgeries, and gave her two years to live. If she would’ve known this was possible she would have never had it put in. It was a death sentence.

  • MariaJune 24, 2022 at 3:25 pm

    I have had the Mirena IUD for 10 years. I was diagnosed in February with breast cancer. Since my diagnosis I have had surgery with lymph node removal oh, Port placement, I am currently going through chemotherapy for the next year and radiation . I am a very healthy 52 year old woman.

  • AmberJune 21, 2022 at 5:11 pm

    Diagnosed in 2013 with aggressive ductal carcinoma. Multiple surgeries, chemo and radiation. Worst decision to get an IUD I knew nothing about. Talked into getting by my doctor. My cancer was progesterone related. ☹️

  • TEQUILAMay 26, 2022 at 11:58 pm

    I am high risk having to get mammograms every 6months I have had mirena for almost 10 years

  • AngelaMay 17, 2022 at 9:09 am

    Was diagnosed with breast cancer on left breast and also lymph nodes. Currently starting treatment incurring high medical bills. Don't have family history of cancer and braca test negative for genetics. Doctor and test show it's hormone related and have to take out IUD. Have been using IUD for over 8 years on second round of IUD. If I would have known cancer risk I would have never used IUD. I h[Show More]Was diagnosed with breast cancer on left breast and also lymph nodes. Currently starting treatment incurring high medical bills. Don't have family history of cancer and braca test negative for genetics. Doctor and test show it's hormone related and have to take out IUD. Have been using IUD for over 8 years on second round of IUD. If I would have known cancer risk I would have never used IUD. I have been in alot of pain and it has caused emotional suffering for me and my family. 1 year married and it's been extremely stressful

  • ShareeMay 16, 2022 at 6:59 am

    I've had the Mirena IUD since 2012, then had it replaced in 2019. I was diagnosed with triple positive invasive ductal carcinoma in my left breast with DCIS in November 2020. I have no family history of breast cancer and no BRCA gene mutation. It was suspicious when my gynecologist ordered that I remove my IUD immediately after receiving news of my breast cancer diagnosis.

  • JohannaMay 6, 2022 at 10:22 pm

    I have invasive ductal carcinoma of my right breast and have had Mirena implanted since 2020.

  • AshleyApril 4, 2022 at 9:30 am

    Stage three triple positive not genetic no history and braca negative all hormone based had iud 8 years

  • JoniApril 3, 2022 at 10:15 am

    I developed breast cancer in my left breast after using the Mirena for almost five years. My surgeon advised me to have it removed immediately. I had the cancer lump removed and also lymph nodes, followed by several radiation treatments.

  • KelliMarch 18, 2022 at 5:57 pm

    I now have cancer after having Mirena for ten years. No cancer in my family and genetics show no cancer. Diagnosed 9/2021 IDC with lymph node involvement and possibly IBC.

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