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55 Fruit StYaw 7eBoston, MA 02114
Phone+1 617-724-0245
Fax+1 617-724-3166
Dr. Ryan is on Doximity
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Education & Training
Mass General Brigham/Brigham and Women's Hospital/Massachusetts General Hospital/Dana-Farber Cancer InstituteFellowship, Hematology and Medical Oncology, 1996 - 1999
New York Presbyterian Hospital (Columbia Campus)Residency, Internal Medicine, 1992 - 1996
Columbia University Vagelos College of Physicians and SurgeonsClass of 1992
Certifications & Licensure
MA State Medical License 1996 - 2027
American Board of Internal Medicine Medical Oncology
Awards, Honors, & Recognition
- CMS Meaningful Use Stage 2 Certification EpicCare Ambulatory 2014 Certified EHR Suite, Epic Systems Corporation, 2013-2017
- CMS Meaningful Use Stage 2 Certification Longitudinal Medical Record, Partners Healthcare System, 2013-2017
- CMS Meaningful Use Stage 2 Certification OpTime Surgical 2014 Certified Module, Epic Systems Corporation, 2013-2017
Clinical Trials
- Oxaliplatin, Fluorouracil, and External-Beam Radiation Therapy Followed by Surgery in Treating Patients With Locally Advanced Cancer of the Rectum
- Radiation Therapy and Either Capecitabine or Fluorouracil With or Without Oxaliplatin Before Surgery in Treating Patients With Resectable Rectal Cancer
- Using Positron Emission Tomography to Evaluate the Effects of Bevacizumab on Intra-tumoral Pharmacokinetics of 5-fluorouracil in Metastatic Colorectal Cancer
Publications & Presentations
PubMed
- A Phase II Study of Nivolumab and Ipilimumab with Radiation Therapy in Patients with Metastatic, Microsatellite Stable Colorectal Cancer.Leontios Pappas, Julie L Koenig, Beow Y Yeap, Jeffrey W Clark, Samuel J Klempner
Clinical Cancer Research. 2026-10-01 - 1 citationsNeoadjuvant Chemotherapy With or Without Radiotherapy in Resected Pancreatic Ductal Adenocarcinoma.Federico De Stefano, Nathaniel F Wu, Giulio Belfiori, Hannah J Roberts, Cristina Ferrone
JAMA Surgery. 2026-10-01 - Actual Five-year Survival After Neoadjuvant Therapy and Resection for Localized Pancreatic Ductal Adenocarcinoma.Federico De Stefano, Giulio Belfiori, Nathaniel F Wu, Jill N Allen, Laura Cerri Crn
Annals of Surgery. 2026-09-10
Lectures
- Optimizing Locoregional Management in the Context of Multidisciplinary CareASCO Gastrointestinal Cancers Symposium - San Francisco, CA - 1/25/2020
Other
- Clinical features, staging, and treatment of anal cancerRyan DP, Willett CG
http://www.uptodate.com/contents/clinical-features-staging-and-treatment-of-anal-cancer
UpToDate, Wolters Kluwer Health - 2013-03-26 - Ampullary carcinoma: Treatment and prognosisRyan DP, Castillo CF, Mamon H
http://www.uptodate.com/contents/ampullary-carcinoma-treatment-and-prognosis
UpToDate, Wolters Kluwer Health - 2012-07-19 - Classification and epidemiology of anal cancerRyan DP, Willett CG
http://www.uptodate.com/contents/classification-and-epidemiology-of-anal-cancer
UpToDate, Wolters Kluwer Health - 2012-12-20
Press Mentions
Leaders of US News’ Top Cancer HospitalsSeptember 22nd, 2026- Mass General Brigham Advances the Future of Early Cancer Detection and DiagnosisAugust 17th, 2026
- Mass General Brigham Cancer Institute to Be Presenting Partner of the Boston 5K Road RaceApril 8th, 2026
Grant Support
- NCTN Lead Academic Participating Site at Dana-Farber/Partners Cancer CareDANA-FARBER CANCER INST2019–2025
Professional Memberships
- Member
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