COVID-19 HEALTH ALERT!  For the safety of our patients and staff, effective March 30, 2020, new patients and patients with disabilities will be permitted one visitor over the age of 15. No other visitors will be permitted into the clinic.  Family members and caretakers may participate in the appointments remotely by phone or video conference if desired. 

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Cassandra Niemi, MD

Gynecologic Oncology/Surgery - Cassandra Niemi, MD

Cassandra Niemi, MD


Gynecologic Oncology/Surgery

Primary Location

Rose Quarter Cancer Center
265 N Broadway
Portland, OR 97227
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Secondary Location

Vancouver Cancer Center
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Medical School

University of Michigan Medical School, Ann Arbor, MI


Oregon Health & Science University, Portland, OR


Gynecologic Oncology Fellowship, University of Wisconsin Hospitals and Clinics, Madison, WI


  • Society of Gynecologic Oncology – Member
  • American Society of Clinical Oncology – Member
  • American College of Obstetrics and Gynecology – Junior fellow


“It’s an amazing privilege to be a part of my patients’ lives. I love building close, lasting relationships so that we can develop treatment plans together that best align with their goals.”

Dr. Niemi specializes in the diagnosis and treatment of women with all gynecologic cancers. She tailors her surgical and medical treatments to her patients’ needs, providing fertility-sparing options and targeted therapies when appropriate. Dr. Niemi has expertise in advanced pelvic surgery including robot-assisted and traditional laparoscopic techniques. Her interests include connecting patients with the latest treatments through clinical trials and maximizing quality of life during and after treatment.

When not working, Dr. Niemi enjoys spending time with her husband and son, hiking in the mountains, playing bass guitar and cycling.

Clinical Interests

Gynecologic cancers, robot-assisted and traditional laparoscopic techniques, fertility-sparing options, targeted therapies and clinical trials.