CyberKnife Team

The FRHS CyberKnife Center Team is here with the answers you need! Contact Nancy Daugherty- Virts, CyberKnife Coordinator with the FRHS Regional Cancer Therapy Center, either by phone at 240-566-4500 or by email


Greg Gagnon M.D.
Dr. Greg Gagnon joined the FRHS CyberKnife Center staff as Medical Director in February 2010. He spent the previous two decades at Georgetown University's Department of Radiation Medicine, serving as Associate Professor of Radiation Oncology, acting Chair of the Department of Radiation Medicine, Chief of Service and CyberKnife Director.As one of the pioneers in CyberKnife radiosurgery, Dr. Gagnon has extensive experience with the technology and has treated thousands of patients. His expertise in treating prostate, breast, lung and pancreatic cancers, as well as the work he has done in pediatric and central nervous system cancers has led to several publications and the co-authorship of two books about radiosurgery. He has been asked to lecture around the world, chiefly about CyberKnife radiosurgery, but also about other varied radiation oncology topics.

Meredith Wernick M.D.
Meredith Wernick M.D. is a board certified Radiation Oncologist. She received her BS in Chemistry and BA in Molecular & Cell Biology at the University of California at Berkeley in 1996. She spent the next four years as a researcher at the UCSF Cancer Center with a focus on the genetics of breast cancer. Dr. Wernick completed her medical training at Georgetown University where she also completed her Internship in Internal Medicine. She completed her residency in Radiation Oncology at the National Capital Consortium: a joint program as a clinical fellow at the NIH and residency at Walter Reed National Military Medical Center. During this time she was awarded the Commander’s Award for Public Service. She is a member of ASTRO: the American Society of Radiation Oncology, the American Society for Clinical Oncology and is a Diplomate of the American Board of Radiology. She has co-authored many peer-reviewed articles in prestigious literary journals such as Nature Genetics, Cancer and PNAS. Dr. Wernick resides in Potomac, Maryland with her husband and two sons.

Wayne E. Flowers
Wayne E. Flowers is a graduate of University of Maryland, Baltimore with a Bachelor's Degree in Information Sciences. He has over 15 years experience working in a Fortune 500 company. After two family members were diagnosed with cancer, Wayne decided to enter the Radiation Oncology field. He received his clinical training at Siani and Good Samaritan of Baltimore, MD. He is a board certified Radiation Therapy Technician in good standing.

Carol Mastalerz
Carol Mastalerz is a results-oriented health care professional with more than 20 years of clinical and management experience in cancer care. She earned her nursing degrees from West Virginia University and Wayne State University and also possesses a Graduate Certificate in the Business of Medicine from Johns Hopkins University. Carol has been with Frederick Regional Health System since 2002 as Director of Oncology Services.

Janet Rhoderick
Janet Rhoderick is a graduate of Elizabethtown College and University of Maryland, School of Social Work. She possesses Master's Degrees in Clinical Social Work and Health Studies, and is a Licensed Certified Social Worker – Clinical (LCSW-C) in the state of Maryland. Janet has worked extensively with Frederick Memorial Hospital's oncology service line since her employment in 2004. She is a Certified Oncology Social Worker (OSW-C) and is a member of the National Association of Social Workers, Association of Oncology Social Work, and the CyberKnife Society.

Nancy Daugherty-Virts
Nancy Daugherty-Virts is a Certified Medical Assistant having received The Academic Excellence in Medical Assisting Curriculum and the Career and Technology Education Awards in 2007 from Frederick Community College. Prior to entering the medical field she held a veterinary assistant certification and has over 20 year’s extensive experience in administration and underwriting with a corporate leader within a highly regulated industry. She has been employed with The Regional Cancer Therapy Center since 2009.