Constantine Stratakis is a Medical Genetics specialist and a Gastroenterologist in Bethesda, Maryland. Dr. Stratakis is rated as an Elite provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Cushing's disease, Neuroendocrine Tumor, Gastrointestinal Stromal Tumor, Orchiectomy, and Hormone Replacement Therapy (HRT).

Dennis Priebat is a Hematologist Oncology specialist and an Oncologist in Washington, Washington, D.c.. Dr. Priebat is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Adult Soft Tissue Sarcoma, Undifferentiated Pleomorphic Sarcoma, Mesenchymoma, and Rhabdomyosarcoma Embryonal.

Steven Zeddun is a Gastroenterologist in Chevy Chase, Maryland. Dr. Zeddun is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Achalasia, Crohn's Disease, Ulcerative Colitis, Endoscopy, and Colonoscopy.

Dr. Dennis A. Cullen is an internist affiliated with Sibley Memorial Hospital. He practices out of Cullen, Umosella, Cullen & Cullen in Bethesda, Md. and Oxon Hill, Md. Dr. Cullen earned his medical degree from Georgetown University School of Medicine. He completed a residency in internal medicine at Georgetown University Hospital. Dr. Cullen has been named a Top MD by Consumers’ Checkbook Magazine, as well as a Top Family/General Practitioner and a Top Internist by Washingtonian Magazine. Recent News Articles and Media Coverage The Brothers Cullen. Bethesda Magazine (January/February 2008). Dr. Cullen is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Multiple Carboxylase Deficiency, Vitamin B12 Deficiency Anemia, Folate Deficiency, and Subacute Combined Degeneration.

Karim Boudadi, M.D., is a medical oncologist and hematologist with the Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital in Washington, D.C., and an assistant professor in the Department of Oncology at Johns Hopkins University School of Medicine. Listen to Dr. Boudadi’s Cancer Matters podcast episode to learn more about his work. Dr. Boudadi has expertise in treating cancers of the head and neck, including salivary gland cancers, as well as cancers of the esophagus, and bone and soft tissue sarcomas. Having completed dual training in medical oncology and hematology at Johns Hopkins University, Dr. Boudadi also treats patients with benign hematologic conditions or non-cancer related blood disorders, such as anemia, low blood counts, bleeding disorders, and clotting disorders. Dr. Boudadi earned his medical degree from the University of Rochester School of Medicine. He completed a residency in internal medicine at the University of Michigan in Ann Arbor, MI, and went on to serve as a clinical lecturer in the Department of Internal Medicine at the University of Michigan Medical School before joining Johns Hopkins. He then completed dual fellowship training in both hematology and medical oncology at the Johns Hopkins University School of Medicine. Dr. Boudadi's research during his fellowship focused on prostate cancer and immunotherapy. Dr. Boudadi is a member of the American Society of Clinical Oncology, the American Society of Hematology, the American College of Physicians, and the American Medical Association. He is also a member of the Hematology and Oncology Fellowship Selection Committee at The Johns Hopkins University School of Medicine. Dr. Boudadi has extensive clinical trial development experience and has published his work in peer-reviewed journals. His primary research interest is immunotherapy. Recent News Articles and Media Coverage Cancer Matters Podcast: Dr. Bill Nelson discussing the treatment of HPV related head and neck cancers, Johns Hopkins Kimmel Cancer Center Podcasts (May 23, 2019). Dr. Boudadi is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Glioma, Mesenchymoma, Undifferentiated Pleomorphic Sarcoma, Gastrointestinal Stromal Tumor, and Prostatectomy.

John Marshall is a Hematologist Oncology specialist and a Hematologist in Washington, Washington, D.c.. Dr. Marshall is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Familial Colorectal Cancer, Colorectal Cancer, Lynch Syndrome, Hepatectomy, and Pancreatectomy.

Mark Steves is a Surgical Oncologist and a General Surgeon in Silver Spring, Maryland. Dr. Steves is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pseudomyxoma Peritonei, Familial Colorectal Cancer, Pancreatic Cancer, Pancreatectomy, and Gastrectomy. Dr. Steves is currently accepting new patients.

Bruce R. Kressel, M.D., is a medical oncologist at Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital and an instructor at Johns Hopkins University School of Medicine. In addition to an expertise in breast and lung cancer, Dr. Kressel has an expertise in gynecologic oncology and general medical oncology, with specific focuses on hematologic malignancies including lymphoma, leukemia and myeloma. Dr. Kressel earned his medical degree at Tufts University School of Medicine. He completed a residency in internal medicine at George Washington University School of Medicine, followed by a fellowship in hematology and oncology, also at George Washington University School of Medicine. Dr. Kressel completed a fellowship in oncology at the Georgetown Lombardi Comprehensive Cancer Center as well. Dr. Kressel has been regularly named one of America’s Top Doctors and one of America's Top Doctors for Cancer by Castle Connolly. He has also been named a Top Doctor in the Washington D.C. and Washington-Baltimore areas by Castle Connolly, as well as a Top Doctor by Consumers’ Checkbook Magazine and Washingtonian Magazine. Dr. Kressel is a member of the American Society of Clinical Oncology and the American Society of Hematology. Dr. Kressel has contributed to numerous publications, presentations and clinical trials. Dr. Kressel is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Essential Thrombocythemia, Non-Hodgkin Lymphoma, Gastric Lymphoma, Chronic Lymphocytic Leukemia (CLL), and Splenectomy.

Dr. Michail Mavros, a surgical oncologist specializing in complex cancers, is deeply committed to offering his patients personalized, advanced care. Originally from Athens, Greece, Dr. Mavros's passion for oncology was sparked during medical school after losing a close friend to cancer. This life-changing event inspired him to dedicate his career to improving the lives of cancer patients. Dr. Mavros is one of few surgeons with accredited subspecialty training in both complex surgical oncology and hepato-pancreato-biliary (HPB) surgery, making him highly qualified to treat cancers of the liver, pancreas, and bile ducts. He is also skilled in minimally invasive techniques, including laparoscopic and robotic-assisted surgery, which offer benefits such as faster recovery, reduced pain, and improved outcomes. At the heart of Dr. Mavros' approach is his belief in individualized care. He works closely with a multidisciplinary team of experts, including medical oncologists, radiation oncologists, and pathologists, to ensure each patient receives a thorough evaluation. This collaborative approach results in comprehensive, personalized treatment plans. By leveraging the latest advances in precision medicine, Dr. Mavros tailors his treatments to meet the unique needs of each patient, guided by the most current scientific research and evidence-based practices. Dr. Mavros is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Familial Pancreatic Cancer, Neuroendocrine Tumor, Pancreatic Cancer, Pancreaticoduodenectomy, and Pancreatectomy.

Valerie Lee, M.D., is a medical oncologist with the Johns Hopkins Sidney Kimmel Cancer Center at Sibley Memorial Hospital, as well as an instructor of medical oncology at Johns Hopkins University School of Medicine. Dr. Lee has an expertise in management of gastrointestinal malignancies, including gastric, colon and pancreatobiliary cancers. Dr. Lee earned her medical degree from the Columbia University College of Physicians and Surgeons. She completed a residency in internal medicine at New York Presbyterian Hospital, followed by a fellowship in medical oncology at the Johns Hopkins University School of Medicine. Dr. Lee is currently earning her Certificate in Science of Clinical Investigation at Johns Hopkins Bloomberg School of Public Health. Dr. Lee is a member of the American Society of Clinical Oncology. Dr. Lee manages multiple early phase trials and her work has been published in peer-reviewed journals. Her research interests include clinical trials for patients with gastrointestinal malignancies, and combining traditional chemotherapies with immunotherapy to improve survival and quality of life for patients. She has received a Cancer Center Training grant for research on molecular targets for cancer detection and treatment and has spoken at numerous conferences on updates in gastrointestinal malignancies. Dr. Lee is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. Her top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Familial Colorectal Cancer, Colorectal Cancer, and Pancreaticoduodenectomy.

Dr. Michael Pishvaian is the director of Gastrointestinal, Developmental Therapeutics and Clinical Research Programs for the Johns Hopkins Kimmel Cancer Center in the Greater Washington Area and an associate professor at the School of Medicine. Dr. Pishvaian is a fellowship-trained gastrointestinal oncologist specializing in pancreatic and refractory colorectal cancers. He is committed to precision medicine and provides his patients with the most appropriate and advanced level of care. He conducts all phases of clinical trials for all GI cancers and enrolls qualifying patients. Click here to learn more about oncology clinical trials the Greater Washington Area. Dr. Pishvaian is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pancreatic Cancer, Colorectal Cancer, Familial Pancreatic Cancer, Pancreaticoduodenectomy, and Pancreatectomy.

Dr. Brett Parker is a general surgeon and fellowship-trained minimally invasive foregut and bariatric surgeon. He is an Assistant Professor of Surgery at Johns Hopkins and also the Program Director for the Johns Hopkins Advanced GI and Minimally Invasive Surgery Fellowship Program. Dr. Parker is an expert in minimally invasive surgical techniques including advanced laparoscopy and robotic surgery, as well as therapeutic flexible endoscopy. He is interested in promoting the evolving indications for surgical repair of hiatal hernias, as well as adjunct procedures surgeons can use to reduce recurrence rates. He offers a wide range of interventions for GERD, including innovative endoscopic therapies, and promotes early surgical referral to discuss and tailor therapy to individual patient circumstances. Dr. Parker also has a robust abdominal wall reconstruction and weight loss surgery practice. He is widely published on the surgical outcomes of foregut surgery, emerging technologies, and innovation, as well as surgical simulation and skills transfer. Dr. Parker has consistently been selected as a Washingtonian Magazine Top Doctor in 2023, 2024, and 2025. As a member of the Johns Hopkins Division of Minimally Invasive Surgery in the Greater Washington Area, Dr. Parker is dedicated to the best, individualized, patient outcomes. Learn more about Dr. Parker and his partners within the Johns Hopkins Division of Minimally Invasive Surgery, the Johns Hopkins Heartburn Center and the Johns Hopkins Motility and Neurogastroenterology Center. Dr. Parker is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Hiatal Hernia, Hernia, Congenital Diaphragmatic Hernia, Endoscopy, and Gallbladder Removal.

Lee Helman is an Oncologist in Bethesda, Maryland. Dr. Helman is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Ewing Sarcoma, Osteosarcoma, Rhabdomyosarcoma, and Adult Soft Tissue Sarcoma.

George Conrad is a General Surgeon in Silver Spring, Maryland. Dr. Conrad is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Cellulitis, Ogilvie Syndrome, Gallstones, Hernia Surgery, and Small Bowel Resection. Dr. Conrad is currently accepting new patients.

Frederick Barr is a Hematologist Oncology provider in Chevy Chase, Maryland. Dr. Barr is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Urothelial Cancer, Muscle Invasive Bladder Cancer, Non-Muscle Invasive Bladder Cancer, and Bladder Cancer. Dr. Barr is currently accepting new patients.

Ramaprasad Srinivasan is a Surgical Oncologist in Bethesda, Maryland. Dr. Srinivasan is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pheochromocytoma, Gastrointestinal Stromal Tumor, Neuroendocrine Tumor, Embryonal Tumor with Multilayered Rosettes, and Nephrectomy.

Anteneh Tesfaye is a Hematologist Oncology provider in Washington, Washington, D.c.. Dr. Tesfaye is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Anal Cancer, Lynch Syndrome, Pancreatic Ductal Adenocarcinoma, and Fibrolamellar Carcinoma. Dr. Tesfaye is currently accepting new patients.

Sam Sater is an Oncologist and a Hematologist in Bethesda, Maryland. Dr. Sater is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Paget Disease of the Breast, EGFR Positive Lung Cancer, Non-Small Cell Lung Cancer (NSCLC), and Lung Adenocarcinoma. Dr. Sater is currently accepting new patients.

Chukwuemeka Ihemelandu is a Surgical Oncologist and a General Surgeon in Washington, Washington, D.c.. Dr. Ihemelandu is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Appendix Cancer, Colorectal Cancer, Familial Colorectal Cancer, Bladder Reconstruction, and Colostomy. Dr. Ihemelandu is currently accepting new patients.

Timothy Kennedy is a Surgical Oncologist and a General Surgeon in Washington, Washington, D.c.. Dr. Kennedy is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Stomach Cancer, Colorectal Cancer, Familial Colorectal Cancer, Pancreatectomy, and Small Bowel Resection. Dr. Kennedy is currently accepting new patients.