The Margie Petersen Breast Center

The Margie Petersen Breast Center at Providence Saint John’s Health Center brings you some of the finest breast cancer care in Southern California. We focus on caring for the whole person: mind, body and spirit. Here, you can benefit from top-notch medical care plus an array of support services that complement your treatment. From the moment you walk through our doors, you can expect to find compassion and a tranquil environment.

Breast Health Clinic

The Breast Health Clinic provides patients with breast concerns the opportunity to see a breast specialist when symptoms arise. Most breast complaints are not related to cancer and issues may be resolved with a simple work up. A complete evaluation by a breast specialist, and imaging services when necessary, can alleviate unnecessary stress and aid in a more pleasant and efficient patient experience. To schedule an appointment, call 310-582-7209.

Services we offer:

  • Advanced breast imaging including tomosynthesis (3-D mammography)
  • Innovative treatments, both surgical and non-surgical, including sentinel node biopsy and targeted radiation
  • Access to clinical trials and research
  • Genetic risk assessment
  • Nutritional counseling
  • Integrative therapies including yoga and meditation
  • Breast cancer prevention strategies

A Team of Experts on Your Side

We take into account your condition, medical history, lifestyle and personal preferences. Then our experts prepare a personalized plan, giving you the most effective, gentlest treatment options. Every breast cancer is different, and not all options are appropriate for everyone. 

Once treatment is over, we help you transition back to normal life and keep a close watch on you. Together, our dedicated team helps you achieve the best outcomes possible.
In addition to our experienced breast surgeon, our collaborative team includes:

  • Breast radiologists
  • Radiation oncologists
  • Pathologists (specialist physicians who analyze tissue specimens)
  • RNs who provide education and support
  • Genetic specialists who focus on risk assessment and prevention
  • Licensed clinical social workers who offer counseling and connect you to resources


Meet Janie Grumley, MD and learn about her philosophy of care and the surgical techniques she uses to treat breast cancer patients.
Learn more ›

Quick Appointments and Same-day Results

Finding a breast lump can be unsettling for both women and men, alike. Fortunately, most mammographic calcifications and painful breast lumps are not cancer, which is why we offer the peace of mind that comes with quickly securing an appointment. Based on your condition, you can receive complete diagnostic testing and same-day results all in one visit.

The Latest Clinical Trials and Research

Clinical trials help doctors and scientists find better ways to diagnose, treat and prevent disease. Individuals who volunteer for clinical trials play an active role in their own health care and help others by advancing medicine. Our doctors make clinical trials a regular part of cancer care. Because the Breast Center is affiliated with the John Wayne Cancer Institute, you can participate in studies led by internationally renowned researchers. If you are interested in a clinical trial, please speak with your doctor.

Healing the Whole Body

Part of the Breast Center, the Willow Sage Sanctuary helps you heal emotionally and physically. Services include nutritional counseling, yoga, mindfulness sessions and support groups. We see individuals who are at high risk for disease, or who have been diagnosed with breast or gynecologic cancer.

The Willow Sage Sanctuary was created thanks to the generous support of Alecia Moore, better known as P!NK. The singer has been supporting the Breast Center since 2012, and Willow Sage Sanctuary was named in honor of her daughter.

Find out your cancer risk

This brief questionnaire will help you determine whether you should be further evaluated for either Hereditary Breast and Ovarian Cancer syndrome or Lynch syndrome. 

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Screening Guidelines Packet

Download our physician-recommended, age-appropriate screening guidelines for women. All women are encouraged to read these guidelines and ask their physician which screening tests are appropriate for them.

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