Kidney cancer cells. Coloured scanning electron micrograph (SEM) of kidney carcinoma cells. Cancer cells divide rapidly in a chaotic manner and may clump to form tumours. They often invade and destroy surrounding tissues. Renal cell carcinoma (RCC) is the most common of the tumours of the kidney in adults, accounting for 86% of neoplasms arising from the kidney. Renal cancers account for approximately 2-3% of all malignancies, with the highest incidence in Western countries. Surgery is the main treatment for kidney cancer that hasn't spread outside the kidney. Magnification: x 1000 when printed at 10cm wide.