Marco Mielcarek, MD, PhD

Marco Mielcarek, MD, PhD

Marco Mielcarek, MD, PhD

  • Medical Director, Adult Blood and Marrow Transplant Program, Fred Hutch
  • Professor, Clinical Research Division, Fred Hutch
  • Professor, Division of Hematology and Oncology, University of Washington School of Medicine

Medical Oncology

“Research is the backbone for improving patient care.”

— Dr. Mielcarek

How do you care for patients?

I believe there are two key ingredients to providing excellent care. The first is tailoring treatment according to your needs and philosophy. An approach that is a good fit for someone else may not be ideal for you, and I never want to make assumptions about what you prefer. The second ingredient is incorporating up-to-date research so that you’re receiving the very best treatment that medicine has to offer, which can sometimes be clinical trials. Participating in trials helps us increase our understanding of diseases and achieve better cure rates.

What do you love about your job?

I arrived in Seattle in 1994 for a research fellowship at the Fred Hutchinson Cancer Center. My plan was to stay for two years and then return to my home in Germany. As you can see, I’m still here. I learned a lot during my fellowship — it was a good collaboration — but I didn’t want the kind of career where I was restricted to the lab. I wanted the privilege of taking care of patients, too. So I decided to stay in the U.S. to pursue those two passions. At Fred Hutch, I get the best of both worlds — working closely with patients and conducting research to make treatment for blood cancers more tolerable.

Provider Background

Area of Clinical Practice
Adult blood and marrow transplantation

Blood Cancers
I am a board-certified oncologist with more than 20 years of experience caring for patients who receive stem cell transplants for blood cancers. I also serve as medical director of Fred Hutch’s Adult Blood and Marrow Transplant Program. My research is aimed at the prevention and treatment of graft-versus-host disease (GVHD) — a potentially dangerous complication that can develop post-transplant where immune system cells attack healthy tissues and organs. For example, one study I led found that patients with GVHD could be effectively treated with lower doses of prednisone (a steroid that can have negative side effects) than most physicians had been using. Currently, my colleagues and I are testing whether treating stem cell donors with statins (drugs widely used to lower cholesterol) can prevent GVHD in transplant recipients.

Diseases Treated

Graft Versus Host Disease



Education, experience and certifications

Medical Degree
Freie Universität Berlin

Freie Universität Berlin, Internal Medicine; University of Washington, Internal Medicine

University of Washington/Fred Hutchinson Cancer Research Center, Medical Oncology

Board Certification
Medical Oncology, 2003, 2013, American Board of Internal Medicine

PhD, Freie Universität Berlin

Clinical Trials

We make promising new treatments available to you through studies called clinical trials led by Fred Hutch physicians. Many of these trials at Fred Hutch have led to FDA-approved treatments and have improved standards of care globally. Together, you and your physician can decide if a study is right for you. 

Find a Clinical Trial Led by Dr. Mielcarek


Many of our Fred Hutch physicians conduct ongoing research to improve standards of patient care. Their work is evaluated by other physicians and selected for publication to the United States National Library of Medicine, the largest medical library in the world. See scientific papers this Fred Hutch physician has written. 

View Dr. Mielcarek's Publications

Your Care Team

At Fred Hutch, you receive care from a team of providers with extensive experience in your disease. Your team includes physicians, a patient care coordinator, a registered nurse, an advanced practice provider and others, based on your needs. You also have access to experts like registered dietitians, social workers, acupuncturists, psychiatrists and more who specialize in supporting people with cancer or blood disorders. 


Fred Hutch accepts most national private health insurance plans as well as Medicare. We also accept Medicaid for people from Washington, Alaska, Montana and Idaho. We are working to ensure that everyone, no matter what their financial situation, has access to the care they need.

For the Media

The Media Relations team at Fred Hutch is available to assist members of the news media who would like to arrange interviews with providers.

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