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Medical Oncology Hematology

The June E. Nylen Cancer Center has a caring and capable medical staff, dedicated to providing personal care to their patients. Below are the biographies outlining their extensive educations, past experiences, as well as memberships in a variety of cancer-related organizations.

Donald B. Wender, Ph.D., MD

Current Medical Director

Dr. Wender received his medical degree from Ohio State University and a Ph.D. in biochemistry from Case Western Reserve University. He completed his internship, residency and fellowship at the University of Pittsburgh Health Center. He is a member of the American College of Physicians, the Iowa Oncology Society and the American Society of Clinical Oncology. He is board-certified in medical oncology by the American Board of Internal Medicine and currently serves as principal investigator for research with participation in the Alliance Clinical Research Group sponsored by the National Cancer Institute. He also serves on the executive committee of ACCRV, a collaborative research group between industry and clinicians.

Radha M. Rao, MD

Dr. Rao earned her medical degree from the Kurnool Medical School and completed her internship at Kurnool General Hospital, both in Kurnool, India. She completed a residency at the State University of New York and a fellowship at Case Western Reserve University. Dr. Rao is a member of the North Central Cancer Treatment Group, the American Society of Clinical Oncology and the Iowa Oncology Society. She is board-certified in medical oncology by the American Board of Internal Medicine.

Susan Roeder, MD

Dr. Susan Roeder earned her medical degree from the University of Osteopathic Medicine and Health Sciences in Des Moines. She completed her internship and  residency at Lutheran General Hospital in Park Ridge, IL and a fellowship in hematology/oncology from the University of Colorado, Denver.  Dr. Roeder previously worked at  the Roy J. and Lucille A. College of Medicine, University of Iowa for 13 years.  There, she served as Clinical Outreach Director and clinical associate professor for the Division of Hematology, Oncology and Blood & Marrow Transplantation.  She is board –certified in Medical Oncology by the American Board of Internal Medicine.


Nasser G. Abu-Erreish, MD

Dr. Nasser Abu-Erreish earned his medical degree from the University of Jordan in Amman Jordan. He completed his internship and residency in medical and surgical specialties at the University of Jordan Hospital and his internal medicine internship and residency at the University of Arkansas.  His fellowship program in Medical Oncology was completed at East Tennessee State University in Johnson City, TN.                     

Dr. Abu previously practiced as a Medical Oncologist at Sky Lakes Medical Center Cancer Treatment Center in Klamath Falls, Oregon, and he served as the Cancer Liaison Physician in Klamath County, OR. He is board-certified in Internal Medicine and Medical Oncology from the American Board of Internal Medicine.

Moscoso 8x10

Dr. Santiago Moscoso, MD

Dr. Santiago Moscoso earned his medical degree from Central University of Ecuador in Quito, Ecuador.  He completed his residency in Internal Medicine at Advocate Illinois Masonic Medical Center in Chicago, IL and his Fellowship in Oncology and Hematology at the Brooklyn Hospital Center.

Dr. Moscoso is board-certified in Internal Medicine, Medical Oncology, and in Hematology, all from the American Board of Internal Medicine.

Roth Department of Radiation Oncology

Greg Naden, MD

Dr. Naden is a native of Cedar Rapids, a graduate of the University of South Dakota and the University of Iowa Medical School, and is board-certified in Radiation Therapy. After serving his internship in Michigan and residency in California, Dr. Naden practiced in Madison, Wisconsin from 1988-2005. He is Board Certified in Radiation Oncology by the American Board of Radiology.

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