Cassandra M. Niemi, MD

Accepting New Patients
4805 Northeast Glisan Street, Suite 11N-1
Portland, OR 97213
2320.8 miles away
Speaks: English

Providence Cancer Institute Franz Gynecologic Oncology Clinic

4805 Northeast Glisan Street, Suite 11N-1, Portland, OR 97213

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About Cassandra M. Niemi

Dr. Cassandra Niemi joined Providence Cancer Institute in 2021 and specializes in caring for people with gynecologic cancers in Portland, OR. She tailors surgical and medical treatments to her patients' needs, providing fertility-sparing options, minimally-invasive surgery, and targeted therapies when appropriate. Dr. Niemi has particular interest in connecting patients with the latest treatments through clinical trials. Her approach to medicine focuses on maximizing quality of life during and after treatment.

She believes that the best care is given when patients and their providers work as a team. “It’s an amazing privilege to be a part of my patients’ lives. I love getting to know my patients, so that we can come up with a treatment plan that honors the whole person.”

Outside of the office, Dr. Niemi enjoys spending time with her husband and two sons, hiking or skiing in the mountains, playing bass guitar and cycling.

Medical School

University of Michigan


University of Wisconsin


Oregon Health & Science University

Professional Associations

Society of Gynecologic Oncology, American College of Obstetricians and Gynecologists

Board Certifications
  • American Board of Obstetrics and Gynecology, Obstetrics and Gynecology
  • American Board of Obstetrics and Gynecology, Gynecologic Oncology
Providence Cancer Institute Franz Gynecologic Oncology Clinic
4805 Northeast Glisan Street, Suite 11N-1
Portland, OR 97213

Providence Cancer Institute Gynecological Oncology Clinic - West
9135 Southwest Barnes Road, Suite 261
Portland, OR 97225

Affiliated Locations
Providence Portland Medical Center
Providence St. Vincent Medical Center

Clinical Interests

  • Adenocarcinoma In Situ Of The Cervix
  • Advanced Stage Ovarian Cancer
  • Advanced Stage Uterine Cancer
  • Cervical Cancer
  • Cervical Cancer Chemotherapy
  • Cervical Cancer Genomics
  • Cervical Dysplasia
  • Endometrial Cancer
  • Endometrial Cancer Genomics
  • Endometrial Cancer Surgery
  • Endometrial Hyperplasia
  • Fallopian Tube Cancer
  • Fallopian Tube Cancer Chemotherapy
  • Genetic Testing For Uterine Cancer
  • Gynecologic (Gyn) Cancer Care
  • Hereditary Breast And Ovarian Cancer
  • Minimally Invasive Gynecologic Surgery
  • Ovarian Cancer
  • Ovarian Cancer Chemotherapy
  • Ovarian Cancer Genomics
  • Ovarian Cancer Risk Assessment
  • Ovarian Cancer Surgery
  • Oviduct Cancer Surgery
  • Robotic Gynecological Surgery
  • Uterine Cancer
  • Uterine Cancer Chemotherapy
  • Vaginal Biopsy
  • Vaginal Cancer
  • Vaginal Cancer Chemotherapy
  • Vulvar Cancer
  • Vulvar Cancer Chemotherapy