Marcus Messmer, MD

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Assistant Professor, Department of Hematology/Oncology


Treatment Philosophy

A cancer diagnosis can be an overwhelming and life-altering event. I am honored to have the privilege of guiding patients and their families through each step of their care. The rapid pace of oncology research has led to the introduction of many novel and targeted therapies, and I take a collaborative approach to personalizing these treatment options for my patients. I am excited to join a comprehensive and multidisciplinary team at Fox Chase that can support patients and families through their treatment and recovery.

Clinical Locations

Educational Background

  • 2018-2021 - Fellow, Medical Oncology, Johns Hopkins University, Baltimore, MD
  • 2014-2017 - Resident, Internal Medicine, Osler Medical Housestaff Training Program, Johns Hopkins, Baltimore, MD
  • 2014-2015 - Intern, Internal Medicine, Osler Medical Housestaff Training Program, Johns Hopkins, Baltimore, MD
  • 2014 - MD, Johns Hopkins University School of Medicine, Baltimore, MD
  • 2009 - Post-Baccalaureate, Premedical Program, Johns Hopkins University, Baltimore, MD
  • 2005 - BS, Mathematics, BA, Philosophy, Indiana University, Bloomington, IN, High Distinction with Honors


  • 2017-Present - American Board of Internal Medicine, Internal Medicine
  • 2020-Present - American Board of Internal Medicine, Medical Oncology


  • 2018-Present - American Society of Clinical Oncology, Member in Training

Honors & Awards

  • 2020 - Merit Award, ASCO Annual Meeting
  • 2014 - Alpha Omega Alpha Honor Society, Johns Hopkins School of Medicine
  • 2005 - Betty Neal Hamilton Award, Department of Philosophy, Indiana University
  • 2005 - Phi Beta Kappa Honor Society, Indiana University
  • 2004 - Wilcox Scholarship, Department of Mathematics, Indiana University
  • 2003 - Hennel Memorial Scholarship, Department of Mathematics, Indiana University
  • 2001-2005 - Honors College Scholarship, Indiana University

Research Interests

  • Developed and authored a multicenter phase II trial investigating venetoclax and rituximab as fist line treatment of mantle cell lymphoma in patient ineligible for aggressive therapy
  • Investigated incidence, clinical characteristics, outcomes, and response to treatment of patients with large granular lymphocytosis after allogenic blood or marrow transplantation
  • Developed database of patients with cutaneous T cell lymphoma to investigate risk of second malignancies and possible genetic predisposition

Selected Publications

Messmer M, Wake L, Tsai HL, Jones RJ, Varadhan R, Wagner-Johnston N. Large Granular Lymphocytosis With Cytopenias After Allogeneic Blood or Marrow Transplantation: Clinical Characteristics and Response to Immunosuppressive Therapy. Transplant Cell Ther. 2021 Mar;27(3):260.e1-260.e6. doi: 10.1016/j.jtct.2020.12.008. Epub 2020 Dec 16. PMID: 33781530

Messmer M, Tsai HL, Varadhan R, Swinnen LJ, Jones RJ, Ambinder RF, Shanbhag SP, Borowitz MJ, Wagner-Johnston N. R-CHOP without radiation in frontline management of primary mediastinal B-cell lymphoma. Leuk Lymphoma. 2019 May;60(5):1261-1265. doi: 10.1080/10428194.2018.1519812. Epub 2019 Jan 18. PMID: 30656983; PMCID: PMC6472975

Additional Publications

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