Our Staff

Our physicians, nurses, laboratory and front office staff provide our patients with the optimum in hematology and oncology care. We are proud of our board certification. This qualifies us to care for those common and more rare blood diseases as well as provide progressive and compassionate treatment for cancer and related tumors.

Hyatt P. DeGreen III, DO (Tracy)

Tracy DeGreen, DOA graduate with a B.S degree from Gettysburg College and a M.A. degree in Molecular Biology from Temple University, Dr. Tracy DeGreen earned his medical degree from the Philadelphia College of Osteopathic Medicine. He served as Chief Intern at Mount Sinai Medical Center in Miami Beach. He completed his residency in Internal Medicine and also his fellowship in hematology and oncology at Penn State Milton Hershey Medical Center. Dr. DeGreen treats all cancers and has a special interest in lung, gastrointestinal, and plasma cell disorders. He is Board Certified in Medical Oncology.

Dr. DeGreen, his wife Melinda, and his daughter live on a small farm in Millersville, PA. He is proud and pleased to have joined his father in practice at Lancaster Cancer Center since 2009. Dr. Tracy DeGreen says, “Taking the time needed to educate a patient and a patient’s loved ones is a priority. Doing so is what the patient deserves.” The History of Caring continues.

“I am devoted to arming every patient and their loved ones with education, support, and the best care and treatment available. It’s my life’s work and the history of our practice.”

Lena Dumasia, MD

Lena Dumasia, MDDr. Dumasia is enthusiastically coming to Lancaster from Toms River, New Jersey. She was a scholarship student at NYU, attended Saba University School of Medicine, and completed her Internal Medicine residency at Hahnemann University School of Medicine and St. Joseph Mercy Hospital in Ypsilanti, Michigan. She served her fellowship in hematology/oncology at Providence Hospital and the University of Michigan Hospitals in Ann Arbor, Michigan. Her list of accomplishments is lengthy, but, most importantly, she is looking forward to serving patients in Lancaster County.

“Cancer is an unexpected and unwanted illness. It will change your life forever in a way that no other illness can. You have the power within you to battle it and in the end, emerge as a stronger person. As your physician, I will help you uncover that strength. This is my passion, role and duty as your oncologist.”

H. Peter DeGreen II, MD

H. Peter DeGreen II, MDDr. DeGreen graduated from Ohio State University College of Medicine in 1972. He did his post graduate training in Internal Medicine and Hematology and Oncology at Tripler Army Medical Center, Hawaii, Walter Reed Army Medical Center, Washington, D.C. and Letterman Army Medical Center in San Francisco. At Letterman he was the Director of Oncology Services and on the teaching staff at the University of California from 1978-1980. He moved to Lancaster in 1980 with his wife, Charlotte, and their three sons and also served on the teaching staff at Penn State Hershey Medical Center. He is a strong patient advocate who is both experienced and compassionate in his dealings with patients and their families.

“I have devoted my professional career as a medical oncologist to conquering cancer in all its forms. For over 30 years, I’ve found that treating the cancer as well as supporting the patient with education and their well-being provides the ultimate outcome in winning the battle.”