Douglas B. Flieder, MD

Dr. Douglas B. Flieder

Clinical Locations

Primary Location

Fox Chase Cancer Center
333 Cottman Avenue
Philadelphia, PA 19111


Professor, Department of Pathology

Director, Surgical Pathology

Director, Autopsy Pathology

Director, Pathology Fellowship Training Program

Head and Neck Cancer TRDG Member


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.  

Education and 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 


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

Research Interests

  • Causes and mechanisms of lung cancer
  • Lung cancer screening 

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