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Margaret Mary Showel, M.D.

Photo of Dr. Margaret Mary Showel, M.D.

Assistant Professor of Oncology


Expertise: Acute Lymphoblastic Leukemia (ALL), Acute Myeloid Leukemia (AML), Hematologic Malignancies, Leukemia, Medical Oncology, Myelodysplastic Syndromes (MDS) more

Research Interests: Leukemia, ALL

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Johns Hopkins Sidney Kimmel Comprehensive Cancer Center
Appointment Phone: 410-955-8964

401 N. Broadway
Baltimore, MD 21231 map
Phone: 410-955-8893
Fax: 410-614-3809

The Bunting Blaustein Cancer Research Building
Appointment Phone: 410-955-8964

1650 Orleans St.
Suite 288
Baltimore, MD 21231 map
Phone: 410-955-8781
Fax: 410-614-3809

Sidney Kimmel Cancer Center at SMH

5255 Loughboro Rd NW
Building B, First Floor
Washington, DC 20016 map
Phone: 202-660-6500
Fax: 202-660-6501


Margaret M. Showel, M.D., is an assistant professor of oncology at Johns Hopkins University School of Medicine, as well as a hematologist in the Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital. Dr. Showel is board certified in medical oncology by the American Board of Internal Medicine. She also practices out of The Bunting Blaustein Cancer Research Building in Baltimore, Maryland.

Dr. Showel has expertise in acute lymphoblastic leukemia, acute myeloid leukemia, hematologic malignancies, leukemia, medical oncology and myelodysplastic syndromes. 

Dr. Showel earned her medical degree from Rush Medical College. She completed a residency in internal medicine at Rush Presbyterian/St. Luke's Medical Center and a fellowship in oncology at Johns Hopkins University School of Medicine. more


  • Assistant Professor of Oncology

Departments / Divisions



  • MD, Rush Medical College (2002)


  • Rush-Presbyterian-St Luke's Medical Center / Internal Medicine (2006)


  • Johns Hopkins University School of Medicine / Oncology (2009)

Board Certifications

  • American Board of Internal Medicine / Medical Oncology (2013)

Research & Publications

Selected Publications

View all on Pubmed

McCurdy, S.R., Kasamon, Y.L., Kanakry, C.G., Bolaños-Meade, J., Tsai, H.L., Showel, M.M., Kanakry, J.A., Symons, H.J., Gojo, I., Smith, B.D., Bettinotti, M.P., Matsui, W.H., Dezern, A.E., Huff, C.A., Borrello, I., Pratz, K.W., Gladstone, D.E., Swinnen, L.J., Brodsky, R.A., Levis, M.J., Ambinder, R.F., Fuchs, E.J., Rosner, G.L., Jones, R.J., Luznik, L. "Comparable composite endpoints after HLA-matched and HLA-haploidentical transplantation with post-transplantation cyclophosphamide." Haematologica. 2017 Feb;102(2):391-400. doi: 10.3324/haematol.2016.144139. Epub 2016 Oct 20.

Pratz, K.W., Rudek, M.A., Gojo, I., Litzow, M.R., McDevitt, M.A., Ji, J., Karnitz, L.M., Herman, J.G., Kinders, R.J., Smith, B.D., Gore, S.D., Carraway, H.E., Showel, M.M., Gladstone, D.E., Levis, M.J., Tsai, H.L., Rosner, G., Chen, A., Kaufmann, S.H., Karp, J.E. "A Phase I Study of Topotecan, Carboplatin and the PARP Inhibitor Veliparib in Acute Leukemias, Aggressive Myeloproliferative Neoplasms, and Chronic Myelomonocytic Leukemia." Clin Cancer Res. 2017 Feb 15;23(4):899-907. doi: 10.1158/1078-0432.CCR-16-1274. Epub 2016 Aug 22.

Gojo, I., Beumer, J.H., Pratz, K.W., McDevitt, M.A., Baer, M.R., Blackford, A.L., Smith, B.D., Gore, S.D., Carraway, H.E., Showel, M.M., Levis, M.J., Dezern, A.E., Gladstone, D.E., Ji, J.J., Wang, L., Kinders, R.J., Pouquet, M., Ali-Walbi, I., Rudek, M.A., Poh, W., Herman, J.G., Karnitz, L.M., Kaufmann, S.H., Chen, A., Karp, J.E. "A Phase 1 Study of the PARP Inhibitor Veliparib in Combination with Temozolomide in Acute Myeloid Leukemia." Clin Cancer Res. 2017 Feb 1;23(3):697-706. doi: 10.1158/1078-0432.CCR-16-0984. Epub 2016 Aug 8.

Kasamon, Y.L., Bolaños-Meade, J., Prince, G.T., Tsai, H.L., McCurdy, S.R., Kanakry, J.A., Rosner, G.L., Brodsky, R.A., Perica, K., Smith, B.D., Gladstone, D.E., Swinnen, L.J., Showel, M.M., Matsui, W.H., Huff, C.A., Borrello, I., Pratz, K.W., McDevitt, M.A., Gojo, I., Dezern, A.E., Shanbhag, S., Levis, M.J., Luznik, L., Ambinder, R.F., Fuchs, E.J., Jones, R.J. "Outcomes of Nonmyeloablative HLA-Haploidentical Blood or Marrow Transplantation With High-Dose Post-Transplantation Cyclophosphamide in Older Adults." J Clin Oncol. 2015 Oct 1;33(28):3152-61. doi: 10.1200/JCO.2014.60.4777. Epub 2015 Aug 10.

Agrawal, V., Christenson, E.S., Showel, M.M. "Tyrosine kinase inhibitor induced isolated pericardial effusion." Case Rep Oncol. 2015 Feb 13;8(1):88-93. doi: 10.1159/000375484. eCollection 2015 Jan-Apr.

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