Skip Navigation
Find a Doctor


Photo of Dr. David Loeb

David Mark Loeb, MD PhD

Director of the Musculoskeletal Tumor Program
Associate Professor of Oncology
Appointment Phone


Main Location

The Johns Hopkins Hospital

View All Locations
Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Director of the Musculoskeletal Tumor Program
  • Associate Professor of Oncology
  • Associate Professor of Pediatrics

Centers & Institutes

  • Pediatric Oncology Program
  • Sidney Kimmel Comprehensive Cancer Center


Acute Lymphoblastic Leukemia, Acute Myeloid Leukemia, Aplastic Anemia, Bone Marrow Transplant, Bone Tumors, Cancer, Chronic Myeloid Leukemia, Clinical Trials, Ewing's Sarcoma, Graft-versus-Host Disease, Hematologic Malignancies, Hodgkin's Disease, Leukemia, Leukemia/Lymphoma, Medical Oncology, Myelodysplastic Syndrome, Non-Hodgkin's Lymphoma, Osteosarcoma, Pediatric Oncology, Rhabdomyosarcoma, Sarcoma, Soft Tissue Sarcoma, Soft Tissue Tumors

Research Interests

Cancer stem cells


Undergraduate degree, BA in Biology from Johns Hopkins University in 1987. PhD from Columbia University, 1993. MD from Columbia University, 1994. Internship and Residency in Pediatrics, Johns Hopkins University 1994-1997. Fellowship in Pediatric Hematology/Oncology, Johns Hopkins University, 1997-2000. Faculty, Johns Hopkins University, 2000-present.


  • English


American Association for Cancer Research, Childrens Oncology Group

Clinical Trial Keywords

  • resistance to chemotherapy
  • osteosarcoma
  • soft tissue sarcomas

Additional Resources

Additional Resources +
  • Education +


    • Columbia University College of Physicians and Surgeons (New York NY ) (1994)


    • Johns Hopkins University School of Medicine / Pediatrics (Baltimore MD ) (1997)


    • Johns Hopkins University School of Medicine / Pediatric Oncology (Baltimore MD ) (2000)


    • Oncology, American Board of Pediatrics - Pediatric Hematology (2008)
  • Research & Publications +

    Selected Publications

    Research Summary

    Dr. Loeb has active laboratory and clinical research efforts. In the laboratory, Dr. Loeb studies a gene called WT1. High levels of WT1 convey a poor prognosis for patients with osteosarcoma and soft tissue sarcomas. Dr. Loebs laboratory has shown that WT1 expression is regulated, in part, by the amount of oxygen in a tumor, and that low oxygen levels lead to higher WT1 expression, which in turn leads to an increase in the ability of tumor cells to cause new blood vessels to form. The laboratory is studying both the mechanism by which oxygen levels control WT1 expression and the way WT1 regulates blood vessel growth. In a related project, Dr. Loebs laboratory is working to identify, characterize, and therapeutically target Ewing sarcoma stem cells. Cancer stem cells are thought to be inherently resistant to chemotherapy and are thought to cause most cases of refractory or relapsed disease. In collaboration with the laboratory of Dr. Jonathan Powell, Dr. Loeb has identified one pathway, called the mTOR signaling pathway, that may be important for sarcoma stem cells to resist chemotherapy. This finding prompted the initiation of a clinical trial, led by Dr. Loeb, to test the combination of Doxil, a standard chemotherapy drug, and Temsirolimus, an inhibitor of the mTOR signaling pathway, in patients with high risk sarcomas. Future clinical trials, already being planned, will test additional means by which the inherent chemoresistance of these key cells can be overcome, hopefully leading to significant improvements in the survival of patients with recurrent or refractory sarcomas.

    Journal Citations

    Savage, W.J.; DeRusso, P.A.; Resar, L.M.; Chen, A.R.; Higman, M.A.; Loeb, D.M.; Jones, R.J.; Brodsky, R.A. Treatment of hepatitis-associated aplastic anemia with high-dose cyclophosphamide. Pediatr Blood Cancer. 2007 Dec;49(7):947-951.

    Loeb, D.M.; Garrett-Mayer, E.; Hobbs, R.F.; Prideaux, A.R.; Sgouros, G.; Shokek, O.; Wharam, M.D., Jr.; Scott, T.; Schwartz, C.L. Dose-finding study of 153Sm-EDTMP in patients with poor-prognosis osteosarcoma. Cancer. 2009 Jun 1;115(11):2514-2522.

    Noronha, S.A.; Farrar, J.E.; Alonzo, T.A.; Gerbing, R.B.; Lacayo, N.J.; Dahl, G.V.; Ravindranath, Y.; Arceci, R.J.; Loeb, D.M. WT1 expression at diagnosis does not predict survival in pediatric AML: a report from the Children's Oncology Group. Pediatr Blood Cancer. 2009 Dec;53(6):1136-1139.

    Hobbs, R.F.; Baechler, S.; Senthamizhchelvan, S.; Prideaux, A.R.; Esaias, C.E.; Reinhardt, M.; Frey, E.C.; Loeb, D.M.; Sgouros, G. A gamma camera count rate saturation correction method for whole-body planar imaging. Phys Med Biol. 2010 Feb 7;55(3):817-831.

    Hobbs, R.F.; McNutt, T.; Baechler, S.; He, B.; Esaias, C.E.; Frey, E.C.; Loeb, D.M.; Wahl, R.L.; Shokek, O.; Sgouros, G. A Treatment Planning Method for Sequentially Combining Radiopharmaceutical Therapy and External Radiation Therapy. Int J Radiat Oncol Biol Phys. 2010 Oct 13.

    Loeb, D.M.; Hobbs, R.F.; Okoli, A.; Chen, A.R.; Cho, S.; Srinivasan, S.; Sgouros, G.; Shokek, O.; Wharam, M.D., Jr.; Scott, T.; Schwartz, C.L. Tandem dosing of samarium-153 ethylenediamine tetramethylene phosphoric acid with stem cell support for patients with high-risk osteosarcoma. Cancer. 2010 Dec 1;116(23):5470-5478.

    Schaeffer, E.M.; Loeb, S.; Walsh, P.C. The case for open radical prostatectomy. Urol Clin North Am. 2010 Feb;37(1):49-55, Table of Contents.

  • Academic Affiliations & Courses +
  • Activities & Honors +


    The Justin Strauss Chordoma Research Award, 2009
  • Videos & Media +
  • Events +
  • Contact & Locations +


    The Johns Hopkins Hospital
    600 N. Wolfe Street
    Bloomberg Children's Center
    11th Floor - Pediatric Oncology
    Baltimore, MD 21287
    Phone: 410-502-7247
    Appointment Phone: 443-287-6997
    Location Map


    • Oncology

Is This You? Edit Profile


© The Johns Hopkins University, The Johns Hopkins Hospital, and Johns Hopkins Health System. All rights reserved.