Malignancy refers to cells that are cancerous. Malignant cells may spread from their primary cancer source. This is called metastatic cancer.
Review Date: 8/30/2012 Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.