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Ruth M. O'Regan, M.D.

Contact Information

Phone Numbers

Appointment: (585) 487-1700

Administrative: (585) 275-8538

Social Links


URMFGA member of the University of Rochester Medical Faculty Group

groupAn Accountable Health Partner

assignmentAccepting New Patients

Faculty Appointments

Patient Care Setting



Professional Background

Dr. Ruth O’Regan, M.D., is the Chair of Medicine and Charles A. Dewey Professor at the University of Rochester. She additionally serves as Physician-in-Chief of Strong Memorial Hospital and as Associate Director of Education and Mentoring at the Wilmot Cancer Institute at University of Rochester.

She previously was Division Chief of Hematology, Medical Oncology and Palliative Care in the Department of Medicine and as Deputy Director at the Carbone Cancer Center at the University of Wisconsin School of Medicine and Public Health (UWSMPH). She served as Chief Scientific officer of the Big Ten Cancer Research Consortium guiding the research and scientific mission of the consortium and as Vice-Chair of the National Comprehensive Cancer Network Board of Directors. Prior to joining the faculty at UWSMPH she was Director of the Glenn Family Breast Cancer Program at the Winship Cancer Institute and as Vice-Chair for Education and Director of the Hematology Oncology Fellowship program in the Department of Hematology and Medical Oncology at Emory University. She additionally served as Chief of Hematology and Medical Oncology at the Georgia Cancer Center for Excellence at Grady Memorial Hospital.

Dr. O’Regan earned her Medical Degree from University College, Dublin, Ireland and completed her Internal Medicine residency at the Medical College of Wisconsin and her Hematology/Oncology fellowship at Northwestern University.

Her research program focuses on identifying mechanisms of resistance to breast-cancer therapies and on the development of new therapies with a specific focus on triple negative breast cancer.



MBBCH | University College Dublin (Republic of Ireland)

Post-doctoral Training & Residency

07/01/1998 - 06/30/1999
Residency in Internal Medicine at McGaw Medical Center of Northwestern University

07/01/1995 - 06/30/1998
Fellowship in Hematology & Oncology at McGaw Medical Center of Northwestern University

07/01/1994 - 06/30/1995
Internship in Internal Medicine at Medical College of Wisconsin

07/01/1992 - 06/30/1994
Fellowship at Mater Misericordiae University Hospital (Ireland)

07/01/1991 - 06/30/1992
Fellowship in Internal Medicine at Mease Hospital Dunedin

07/01/1988 - 06/30/1991
Residency in Internal Medicine at Mater Misericordiae University Hospital (Ireland)

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Journal Articles

Tolaney SM, Kalinsky K, Kaklamani V, D'Adamo DR, Aktan G, Tsai ML, O'Regan RM, Kaufman PA, Wilks ST, Andreopoulou E, Patt DA, Yuan Y, Wang G, Savulsky C, Xing D, Kleynerman E, Karantza V, Diab S. "Eribulin Plus Pembrolizumab in Patients With Metastatic Triple-Negative Breast Cancer (ENHANCE 1): A Phase 1b/2 Study." Clinical cancer research : an official journal of the American Association for Cancer Research.. 2021 Mar 16; Epub 2021 Mar 16.

Dudek AZ, Liu LC, Fischer JH, Wiley EL, Sachdev JC, Bleeker J, Hurley RW, Tonetti DA, Thatcher GRJ, Venuti RP, O'Regan RM. "Phase 1 study of TTC-352 in patients with metastatic breast cancer progressing on endocrine and CDK4/6 inhibitor therapy." Breast cancer research and treatment.. 2020 Oct; 183(3):617-627. Epub 2020 Jul 22.

Zhao J, Meisel J, Guo Y, Nahta R, Hsieh KL, Peng L, Wei Z, O'Regan R, Li X. "Evaluation of PD-L1, tumor-infiltrating lymphocytes, and CD8+?and FOXP3+?immune cells in HER2-positive breast cancer treated with neoadjuvant therapies." Breast cancer research and treatment.. 2020 Oct; 183(3):599-606. Epub 2020 Jul 26.