Diane MacDonald, M.D., F.A.C.P., director of the medical oncology program at MidMichigan Gratiot Cancer Center, specializes in the diagnosis, treatment and prevention of blood diseases and cancer. She is on the active medical staff at Gratiot Medical Center and currently sees patients in Alma, Carson City and St. Johns. Dr. MacDonald earned her medical degree from Michigan State University, College of Human Medicine, in East Lansing, where she also completed a residency in internal medicine and a fellowship in hematology and oncology. She is board certified in hematology and medical oncology.