Douglas B. Flieder, MD

Dr. Douglas B. Flieder
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Clinical Locations

  • Fox Chase Cancer Center
    333 Cottman Avenue
    Philadelphia, PA 19111
    Phone: 888-369-2427

Professor, Department of Pathology

Director, Surgical Pathology

Director, Autopsy Pathology

Director, Pathology Fellowship Training Program


  • Anatomic Pathology

Areas of Expertise

Lung Cancer, Breast Cancer

Treatment Focus

Surgical pathology with focus on lung and mediastinal diseases.


Treatment Philosophy

As a surgical pathologist, I am responsible for diagnosing diseases and staging the extent of malignancies on varying sized tissue samples procured from patients by clinicians and radiologists.  For example, microscopic examination of a breast core biopsy uncovers the cause of mammographic calcifications, and diagnosing a particular subtype of lung cancer from a surgical specimen ensures that the patient receives appropriate treatment. 

With particular interest in lung diseases, I collaborate with pathologists, clinicians, and researchers at the Center, and participate in national and international studies related to tumors, mostly lung, and pulmonary non-neoplastic diseases.  In addition, I participate in national and international lung pathology societies and educate peers and physicians-in-training.  

Educational Background

  • Fellow, Pulmonary and Mediastinal Pathology, Armed Forces Institute of Pathology, and National Cancer Institute, Laboratory of Human Carcinogenesis, Washington, DC
  • Resident, Anatomic Pathology, Massachusetts General Hospital, Boston, MA
  • Resident, Internal Medicine, New York University/Bellevue Hospital Center, New York, NY
  • MD, University of Rochester School of Medicine and Dentistry, Rochester, NY, 1992 


  • American Board of Pathology - Anatomic Pathology


  • United States and Canadian Academy of Pathology
  • Pulmonary Pathology Society
  • International Association for the Study of Lung Cancer 

Honors & Awards

  • Philadelphia Magazine Top Doctors, 2024

Research Interests

  • Causes and mechanisms of lung cancer
  • Lung cancer screening 

The following ratings and reviews are based on verified feedback collected from independently administered patient experience surveys. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy. Learn more about our Patient Experience Ratings.

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