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Jenna Shearer, CRNP

Jenna Shearer is a Certified Registered Nurse Practitioner who joined our practice in 2022. She received her Master of Science in Nursing (MSN) from Chamberlain University in Illinois. She received her Bachelor of Science in Nursing (BSN) from York College [...]

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Grigori Okoev, MD

In December 2022, Cancer Care Associates of York welcomed Dr. Grigori Okoev to our practice. Dr. Okoev is a graduate of Yerevan State Medical University in Armenia, where he received his MD. He completed an internal medicine residency program at [...]

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Haiyun Wang, MD

Dr. Wang received her MD degree from Zhejiang Medical University in China, and MPH degree from Johns Hopkins University Bloomberg School of Public Health. She completed her internship and residency training at Geisinger Medical Center in Danville, PA.  She then [...]

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John Zerfing, CRNP

John Zerfing is a Certified Registered Nurse Practitioner who has been part of the Cancer Care practice for years. He originally started at Cancer Care as a Registered Nurse in 2012, and later became a CRNP in September 2020. He [...]

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L. Eamonn Boyle, MD, FACP (retired)

Dr. Boyle is a 1970 graduate of the University College Dublin in Ireland with internship and residency training in Bryn Mawr Hospital, Bryn Mawr, PA. He completed his Hematology and Medical Oncology Fellowships at the M.D. Anderson Hospital and Tumor [...]

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Daniel Efiom-Ekaha, MD, FACP

Dr. Ekaha is a 1995 graduate of the University College Hospital, University of Ibadan in Nigeria with internship and residency training at the Royal College of Obstetricians and Gynecologists, Cornwall Region Hospital in St. James, Jamaica. He completed his Internal [...]

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Joyce Huang, MD

Dr. Huang is a 2001 graduate of Nantong Medical College in China. She received her Ph.D. from the University of Medicine and Dentistry of New Jersey in Newark. She performed her Internship and Residency at Saint Barnabas Medical Center in [...]

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