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Dr. Evan S. Ong

Dr. Evan S. Ong

Surgical Oncologist

Dr. Evan S. Ong is a surgical oncologist who treats peritoneal mesothelioma at the Swedish Medical Center in Seattle. He offers treatments including hyperthermic intraperitoneal chemoperfusion.

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About Evan S. Ong

  • Peritoneal Mesothelioma icon

    Peritoneal Mesothelioma

  • Heated Chemotherapy icon

    Hyperthermic Intraperitoneal Chemotherapy

  • Robotic Surgery icon

    Robotic Surgery

  • Board Certified icon

    Board Certified in Surgery

Ong focuses his practice on abdominal cancers such as peritoneal mesothelioma, which often is treated with a combination of cytoreductive surgery and hyperthermic intraperitoneal chemoperfusion (HIPEC).

The Swedish Medical Center is the only cancer facility in the Pacific Northwest offering this combination, which has proven its effectiveness for this hard-to-treat cancer.

The aggressive procedure includes a meticulous surgery that removes all visible tumor cells throughout the abdominal cavity.

The surgery is followed with a high-dose, heated chemotherapy solution that is circulated throughout the abdomen for 90 minutes to kill any tumor cells that evaded the surgeon.

The entire procedure can take anywhere from six to 12 hours. It can also be used for cancers that have spread from the intestines, colon, liver and ovaries.

“After surgery, what is left is almost microscopic, and that makes the chemotherapy more effective in killing the remaining tumor cells,” Ong said. “By putting it directly into the abdomen (and not systemically), you are getting a better response, and it has shown to prolong survival.”

Experience with Leading-Edge Techniques

Ong previously served at the University of Arizona Medical Center, where he co-authored a study detailing the early years of the HIPEC procedure at the facility.

“In the past, no effective treatment options were available for these patients,” he said. “Regional and metastatic disease is the new frontier in cancer treatment.”

Ong also has a particular interest in pancreatico-biliary cancers. He offers minimally-invasive and robotic surgery where it is possible, along with radiofrequency ablation and irreversible electroporation.

“The primary concern for a patient is knowing all your options. And there is no such thing as having no options,” he said. “If we can’t provide a cure surgically, we can create a plan and provide expectations for a patient to know.”

Personalized Treatments and Collaborative Approach

Ong has been lauded for the extra time he takes in personalizing his treatment plans and educating his patients on what they are facing.

He talks often about the collaborative approach to treatment that helps make the Swedish Medical Center so impressive. He meets with oncologists, radiologists and pathologists weekly to discuss each patient.

“I make my patients comfortable by providing knowledge,” he said. “The anxiety for patients comes when they don’t know what to expect for this disease they are being treated for. I give them knowledge so they don’t have that fear of the unknown. That’s what builds trust.”

Ong earned his degree from the Albert Einstein College of Medicine. He completed a residency at the University of Illinois at Chicago Medical Center and his fellowship at the Roswell Park Cancer Institute in Buffalo, New York.

Disclaimer: Dr. Evan S. Ong has no professional affiliation with

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Tim Povtak is an award-winning writer with more than 30 years of reporting national and international news. His specialty is interviewing top mesothelioma specialists and researchers, reporting the latest news at mesothelioma cancer centers and talking with survivors and caregivers.

Daniel King, Content Writer for
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2 Cited Article Sources

The sources on all content featured in The Mesothelioma Center at include medical and scientific studies, peer-reviewed studies and other research documents from reputable organizations.

  1. Swedish Medical Center. (n.d.). Evan S. Ong, MD.
    Retrieved from:
  2. Konstantinidis, I. (2012, June 27). Cytoreductive surgery and hyperthermic intraperitoneal chemoperfusion: The University of Arizona early experience. Retrieved from:

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Last Modified August 2, 2020

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