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Molly S. Stumacher, MD

Molly S. Stumacher, MD Physician

Clinical Associate of Medicine Clinical Associate

Dr. Stumacher is employed by Penn Medicine.

About Dr. Molly S. Stumacher

Recognized by America's Top Doctors 2015 - 2017

Recognized by Main Line Today's Top Doctor's 2016 issue

Recognized by Philadelphia magazine's annual Top Docs issue, 2015 - 2018

Patient Satisfaction Ratings

Patient Rating Breakdown

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our nationally-recognized Press Ganey Patient Satisfaction Survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

Responses are measured on a scale of 1 to 5 with 5 being the best score.

The comments are submitted by patients and reflect their views and opinions. The comments are not endorsed by and do not necessarily reflect the views of Penn Medicine.

Overall Ratings

Patient Comments

Clinical Specialties


  • Hematology
  • Medical Oncology

Programs & Centers:

Board Certification:

  • Hematology, 2008
  • Medical Oncology, 2007

Clinical Expertise:

  • All Cancer Types
  • Anal Cancer
  • Anemia
  • Bile Duct Cancer
  • Breast Cancer
  • Colon Cancer
  • Esophageal Cancer
  • Gallbladder Cancer
  • Gastrointestinal Cancer
  • Lung Cancer
  • Lung Carcinoid Tumor
  • Lymphoma
  • Non-Hodgkin Lymphoma
  • Non-Small Cell Lung Cancer
  • Pancreatic Cancer
  • Rectal Cancer
  • Small Cell Lung Cancer
  • Stomach Cancer (Gastric Cancer)

Practice Locations and Appointments

Insurance Accepted

  • Aetna US Healthcare
  • Amerihealth Caritas
  • Amerihealth Caritas Medicare
  • Cigna
  • Cigna HealthSpring
  • Clover Health Plan
  • CVS Health
  • Devon Health Services (Americare)
  • Gateway Health Plan
  • Geisinger Health Plan
  • HealthAmerica / HealthAssurance, a Coventry Plan
  • HealthPartners
  • HealthPartners Medicare
  • HealthSmart
  • Highmark Blue Shield
  • Humana / Choicecare
  • Independence Blue Cross (Keystone East)
  • Intergroup
  • Multiplan
  • NJ Qualcare
  • Oxford Health Plan
  • PA Medicaid
  • PA Medicare
  • Preferred Health Care/LGH
  • Rail Road Medicare / Palmetto GBA
  • Remedy Partners at Penn Medicine
  • Tricare
  • United Healthcare
  • UnitedHealthcare Community Plan
  • US Family Health Plan

Education and Training

Medical School: Harvard Medical School
Residency: Brigham and Women's Hospital
Fellowship: Hospital of the University of Pennsylvania


American Society of Clinical Oncology, National Chester County Medical Society, Local Pennsylvania Medical Society, Local

Hospital Affiliation

Dr. Stumacher is employed by Penn Medicine.

Hospital Privileges:

  • Chester County Hospital: Has privileges to treat patients in the hospital.
  • Penn Presbyterian Medical Center: On the medical staff, but does not have privileges to treat patients in the hospital.


Selected Publications:

Vonderheide RH, Flaherty KT, Khalil M, Stumacher MS.: Clinical Activity and Immune Modulation in Cancer Patients Treated with CP-870,893, A Novel CD40) Agonist Monoclonal Antibody. J Clin Oncol. 8 (25): 876-83,2007.

Vonderheide R, Stumacher M.: CD40 Antibody for the Treatment of Advanced Solid Tumors (Phase I Study). University of Pennsylvania Department of Hematology-Oncology : 2006.

Domcheck S, Stumacher M.: CTLA4 Antibody in the Treatment of Advanced Breast Cancer (Phase I Study). University of Pennsylvania Department of Hematology-Oncology : 2006.

Stumacher M, Domchek S.: Update on chemoprevention in BRCA1 and BRCA2 mutation carriers. Breast Cancer Online 8 (9): 2005.

Weeks J, Joffe S, Stumacher M.: The Use of Executive Summaries in Cancer Patients' Consent to Clinical Trial Enrollment (Phase II study). Dana Farber Cancer Institute : 2003.

Academic Contact Info

Penn Hematology/Oncology
Suite 201
440 East Marshall Street

West Chester, PA 19380
Phone: (610) 738-2500
Patient appointments: 800-789-7366 (PENN)