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Review: could Orencia cause Breast cancer?

Summary: Breast cancer is found among people who take Orencia, especially for people who are female, 60+ old, have been taking the drug for 1 - 2 years, also take medication Methotrexate, and have Rheumatoid arthritis. We study 5,858 people who have side effects while taking Orencia from FDA and social media. Among them, 15 have Breast cancer. Find out below who they are, when they have Breast cancer and more.

You are not alone: join a support group for people who take Orencia and have Breast cancer >>>

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Orencia has active ingredients of abatacept. It is often used in rheumatoid arthritis. (latest outcomes from 5,938 Orencia users)

Breast cancer

Breast cancer has been reported by people with hormone replacement therapy, multiple sclerosis, rheumatoid arthritis, menopausal symptoms, osteoporosis. (latest reports from 77,363 Breast cancer patients)

On May, 8, 2015: 5,857 people reported to have side effects when taking Orencia. Among them, 15 people (0.26%) have Breast Cancer.

Trend of Breast cancer in Orencia reports

Time on Orencia when people have Breast cancer * :

< 1 month1 - 6 months6 - 12 months1 - 2 years2 - 5 years5 - 10 years10+ years
Breast cancer0.00%16.67%16.67%33.33%33.33%0.00%0.00%

Gender of people who have Breast cancer when taking Orencia * :

Breast cancer93.33%6.67%

Age of people who have Breast cancer when taking Orencia * :

Breast cancer0.00%0.00%0.00%0.00%0.00%16.67%33.33%50.00%

Severity of Breast cancer when taking Orencia ** :


How people recovered from Breast cancer ** :


Top conditions involved for these people * :

  1. Rheumatoid arthritis (13 people, 86.67%)

Top co-used drugs for these people * :

  1. Methotrexate (5 people, 33.33%)
  2. Arava (2 people, 13.33%)
  3. Humira (2 people, 13.33%)
  4. Imuran (2 people, 13.33%)
  5. Celebrex (1 people, 6.67%)

* Approximation only. Some reports may have incomplete information.

** Reports from social media are used.

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

Get connected: join our support group of orencia and breast cancer on

Do you have Breast Cancer while taking Orencia?


You are not alone! Join a support group on :
- support group for people who take Orencia and have Breast Cancer
- support group for people who take Orencia
- support group for people who have Breast Cancer

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  • jcolville on Mar, 2, 2015:

    My aunt had endometriosis. I know she was given lupron. Not sure how many rounds. I know she ended up having a hysterectomy (total) and started HRT. She waa diagnosed with breaat cancer quickly (maybe 1-6 months). I really dont know. i know my mom told me HRT

    but she said the dr said happened very quickly

    And think may have had before. But we dont know.

    I took lupron in 2006 for endometriosis. I had severe, adverse reactions the very next day. I was in agony. My bones and pelvic abdominal pain was the worst in my life. My BP was aky high and went to ER twice. I also had a seizure and fainted. I did end up having hysterectomy in 2013. I kept ovaries because my mom told me my aunt got cancer from HRT. My mom doesnt have endo but my aunt did. She passed away in 2010. I am learning contrary to what drs have told me. Other women suffer from bone/joint/muscle pain, migraines. What if lupron is what caused my aunt's breast cancer? Its a truly evil drug but if it causes cancer than maybe they will finally ban it. Give us poisoned a diagnosis. But make sure no more have to suffer


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