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Andrew J. Ewald, Ph.D.

Headshot of Andrew J. Ewald
  • Professor of Cell Biology


Breast Cancer, Cancer, Fibrosis, Metastatic Disease more

Research Interests

Cellular and molecular mechanisms of epithelial growth, invasion and metastasis; focus on how clusters of cancer cells disseminate from the tumor, traverse the systemic circulation, and cooperate with resident stromal cells to colonize distant organs. more


Dr. Andrew Ewald seeks to understand how cells build organs and how these same cellular processes can contribute to cancer metastasis. Dr. Ewald’s research lab recently identified a unique class of breast cancer cells that lead the process of invasion into surrounding tissues—a first step in cancer metastasis. Further research is planned to examine if these cells are viable targets for therapy.

Dr. Ewald received his undergraduate degree in physics with honors from Haverford College. He earned his Ph.D. in biochemistry and molecular physics from the California Institute of Technology. He completed postdoctoral work with Zena Werb in mammary biology and cancer at the University of California, San Francisco. Dr. Ewald joined the Johns Hopkins faculty in 2008.

He is a member of the American Association for Cancer Research, Society for Developmental Biology, and the American Society for Cell Biology. His work was recognized with the 2011 Morphological Sciences Award from the American Association of Anatomists for his contributions to the field of epithelial morphogenesis. more


  • Professor of Cell Biology
  • Professor of Biomedical Engineering
  • Professor of Oncology

Departments / Divisions

Centers & Institutes



  • Ph.D.; California Institute of Technology (California) (2003)
  • B.S.; Haverford College (Pennsylvania) (1997)

Additional Training

  • University of California at San Francisco, San Francisco, CA, 2008, Epithelial Biology and Cancer

Research & Publications

Research Summary

The Ewald Lab conducts both basic and translational related to the molecular regulation of collective cell migration during normal mammary development and during the invasion and metastatic spread of mammary tumors.

During his postdoctoral studies, Dr. Ewald studied the cellular basis of branching morphogenesis in the mammary gland. He demonstrated that normal mammary branching morphogenesis occurred through the generation of a high proliferation, low apico-basal polarity, high motility, transiently stratified epithelial intermediate. As this normal developmental process dynamically regulated many of the properties that are modulated during human breast tumor progression, he developed a series of related assays that enabled direct culture, observation and molecular manipulation of mouse models of mammary carcinoma, human mammary epithelium, and human mammary carcinomas.

The Ewald Lab uses advanced time-lapse microscopy and molecular genetics to study the normal development of tissues, with a primary focus on the mammary gland. His team is trying to understand the cellular and molecular processes that enable normal epithelial cells to progress to invasive and eventually metastatic breast cancer.

Clinical Trials

Learn more about clinical trials at Johns Hopkins Medicine.

Selected Publications

View all on PubMed

Nguyen-Ngoc KV, Cheung KJ, Brenot A, Shamir ER, Gray RS, Hines WC, Yaswen P, Werb Z, Ewald AJ, “The ECM microenvironment regulates collective migration and local dissemination in normal and malignant mammary epithelium” Proc Natl Acad Sci U S A. 2012 Sep 25;109(39):E2595-604.

Beck JN, Singh A, Rothenberg AR, Elisseeff JH, Ewald AJ, “The independent roles of mechanical, structural and adhesion characteristics of 3D hydrogels on the regulation of cancer invasion and dissemination,” Biomaterials, 2013 Dec;34(37):9486-95.

Cheung KJ, Gabrielson E, Werb Z, Ewald AJ, “Collective invasion in breast cancer requires a conserved basal epithelial program,” Cell. 2013 Dec 19;155(7):1639-51.

Shamir ER, Papallardo E, Jorgens DM, Coutinho K, Tsai WT, Aziz K, Auer M, Tran PT, Bader JS, Ewald AJ, “Twist1-induced dissemination preserves epithelial identity and requires E-cadherin,” The Journal of Cell Biology. 2014 Mar 3;204(5):839-56.

Cheung KJ, Padmanaban VP, Silvestri V, Schipper K, Fairchild AN, Ewald AJ, “Distant metastasis occurs through collective epithelial dissemination,” PNAS, 2016 Feb 16;113(7):E854-63.

Contact for Research Inquiries

Johns Hopkins University School of Medicine
855 N. Wolfe Street
452 Rangos Building
Baltimore, MD 21205 map
Phone: 410-614-9288
Fax: 410-614-8375

Email me

Academic Affiliations & Courses

Graduate Program Affiliation

Biochemistry, Cell and Molecular Biology Graduate Program

Activities & Honors


  • Morphological Sciences Award, American Association of Anatomists, 2011
  • Grant, Beckman Institute Executive Committee, 2002
  • Distinguished Lecturer, Braman Family Breast Cancer Institute, 2010
  • Best Graduate Student: West Coast Mtg, Society for Developmental Biology, 2001
  • NIH Institutional Postdoctoral Fellowship: CVRI, UCSF, 2003
  • 1st Place in Basic Science Research, Johns Hopkins Breast Cancer Retreat, 2009
  • Dean’s Postdoctoral 2nd Prize, UCSF School of Medicine , 2008
  • Travel Award, UCSF School of Medicine , 2008
  • Postdoctoral Fellow, California Breast Cancer Research Program, 2005
  • Student Travel Award & Contributed Talk, American Association of Anatomists, 2003
  • Student Travel Award, National Meeting of the Society for Developmental Biology, 2002
  • Pilot Research Grant, Burroughs Welcome Fund , 1998
  • Graduate Fellowship: Caltech Initiative in Computational Molecular Biology, Burroughs Welcome Fund , 1997
  • Honors in Physics, Haverford College, 1997
  • Howard Hughes Biomedical Research Scholar, Haverford College, 1996
  • National Merit Scholar, 1993


  • American Association for Cancer Research
  • American Society for Cell Biology
  • Society for Developmental Biology
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