NEW VISITOR POLICY in effect as of Friday, March 27
See all Novel Coronavirus Information for Penn Medicine Patients


Due to the recent Novel Coronavirus emergency, some locations may be operating with different hours or temporarily closed.

Our clinical experts support patients through diagnosis, treatment and survivorship. This team is supported by the full medical and radiation oncology teams, as well as breast imaging.

  • Aaron D. Bleznak, MD, MBA, FACS, FSSO

    Medical Director, Breast Program, Ann B. Barshinger Cancer Institute
    Adjunct Associate Professor of Surgery

    Endocrine and Oncologic Surgery
  • Marnie S. Kaplan, MD, FACS

    Endocrine and Oncologic Surgery
  • Steven L. Parker, MD, FACS

    General Surgery
  • Kelly J. Janke, DO

    General Surgery
  • John H. Bast, MD

    Clinical Assistant Professor of Surgery, Penn Medicine Lancaster General Health
    Clinical Assistant Professor of Surgery

    Plastic Surgery
  • Ami P. Jhaveri, MD

    Hematology, Medical Oncology
  • Elizabeth C. Horenkamp, MD

    Hematology, Medical Oncology
  • Pamela J. Boimel, MD, PHD

    Radiation Oncology
  • Ronald T. Grenko, MD

    Clinical Associate of Pathology and Laboratory Medicine

    Pathology and Laboratory Medicine
  • Nitin K. Tanna, MD

  • Julie Justice headshot

    Julie Justice, BSN, RN, OCN, CBCN

    Nurse Navigator

    Breast Cancer

  • Amy Hester headshot

    Amy Hester, APRN, BC, OCN, CBCN

    Nurse Navigator

    Breast Cancer

  • Gretchen Thomas headshot

    Gretchen Thomas, BSN, RN, OCN

    Nurse Navigator

    Breast Cancer

  • Randall A. Oyer, MD

    Chairman, Cancer Committee, Lancaster General Health
    Medical Director, Ann B. Barshinger Cancer Institute, Lancaster General Health
    Medical Director, Cancer Risk Evaluation Program, Lancaster General Health
    Medical Director, Oncology, Lancaster General Health

    Hematology, Medical Oncology
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