What is kidney cancer? Kidney cancer starts in the cells of the kidney. Cancerous (malignant) tumor is a group of cancer cells that can invade and destroy nearby tissue. The tumor can also spread (metastasize) to other parts of the body. The kidneys are part of the urinary tract. We have two kidneys, one on … Continue reading Kidney Cancer | Symptoms, Stages, Types, Diagnoses, Chances of Surviving, Treatments