About

Sarah Hassan, MD joined the OC Blood & Cancer Care team in 2018. Originally from Chicago, she is excited to call Orange County her new home.

Before she began residency, Dr. Hassan worked as a research associate at the University of Illinois Department of Surgery in Chicago. While assisting with Islet Cell Transplant for Type 1 Brittle Diabetics, she discovered an interest in immunology, molecular biology, and progressive treatment options that aim to cure presumed incurable diseases. This experience greatly influenced her decision to pursue work in cancer treatments.

Dr. Hassan completed her Internal Medicine residency at St Vincent’s Mercy Medical Center in Toledo, Ohio in 2015. She completed her fellowship in Hematology/Oncology at the University of Cincinnati Medical Center in 2018. She is triple board certified in Internal Medicine, Hematology, and Medical Oncology.

Dr. Hassan supports Integrative Medicine and although she enjoys working with all patients, she is most interested in treating breast cancer. She strongly values patient autonomy and personalized medicine. Her goal is to provide empathetic care and dignity to every patient she treats.

In her free time Dr. Hassan loves to hike, spend time at the beach, travel, learn different languages, and appreciate art. She is fluent in Urdu and understands basic Polish and Spanish.

Board Certifications:
  • American Board of Internal Medicine- Internal Medicine
  • American Board of Internal Medicine-Medical Oncology
  • American Board of Internal Medicine-Hematology
Areas of Interest:
  • Breast Cancer
  • Supports Integrative Medicine
Languages

English

Provider Specialty

Hematology-Oncology, Hematology/Oncology

Areas of Care

Education

Medical School

Bahria University, Shifa College of Medicine

2008

Internship Program - Internal Medicine

Mercy St. Vincent Medical Center

2013

Residency Program - Internal Medicine

St Vincent Mercy Medical Center GME

2013

Internship/Residency - Internal Medicine

Mercy St. Vincent Medical Center

2015

Fellowship Program - Hematology

University of Cincinnati Medical Center

2018

Locations & Affiliations

Locations

MemorialCare Cancer Institute - Orange Coast Medical Center (Patient Care Pavilion)

18111 Brookhurst St. Suite 6100

Fountain Valley, CA

Office: 657-241-9755

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Affiliations

Research

428-23 | A Phase III, Open-Label, Randomised Study to Assess the Efficacy and Safety of Extended Therapy with Camizestrant (AZD9833, a Next Generation, Oral Selective Estrogen Receptor Degrader) versus Standard Endocrine Therapy (Aromatase Inhibitor or...

Trial Number: 428-23

Condition: Breast Cancer

Conducted at: Orange Coast Medical Center

Participant Age Range: 18 years to 100 years

Participant Gender: Any

Enrolling Participants: Yes

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Insurance

Please consult your health care provider or health plan for the most accurate information about your health plan’s coverage of a particular health care service offered at a MemorialCare facility. Learn more about our Accepted Health Plans.

Patient Reviews

5.0 out of 5
(500 Ratings)
Apr 14, 2026
Sharon S.
She's a good doctor but I forgot to ask her for something
Apr 14, 2026
Noreen A.
Dr. Hassan is an excellent doctor, she has a beautiful spirit, personality she’s understanding and concerned and takes the time to listen about my health, wellbeing. I highly recommend her for anyone who would love to have a doctor like her.
Apr 14, 2026
Jamie F.
Apr 13, 2026
Gregory K.
Dr Hassan is one of the best doctors as she is always friendly and always cares about my overall well being
Apr 13, 2026
Lisa D.
Love Dr. Hassan! She is awesome! Kind, friendly, knowledgeable and a great doctor.
Apr 10, 2026
Cherie B.
She is terrific! Very caring and listens well
Apr 9, 2026
Yaowaret B.
Very nice
Apr 9, 2026
Sheila P.
Personable. Explains medical issues clearly and consisely
Apr 9, 2026
Patricia S.
Dr Hassan is a great doctor and takes the time to listen to the patient. She is always happy and very knowledgeable. Would highly recommend Dr Hassan.
Apr 9, 2026
Shaney W.
Dr. Hassan is always prompt, personable, and will take the time to answer any questions I have.
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Source: Reviews are aggregated from third-party review sites such as Facebook, Google, HealthGrades, RepuGen, Vitals, WebMD, and Yelp.