<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Cancer that forms in tissues of the kidneys. Kidney cancer includes renal cell carcinoma (cancer that forms in the lining of very small tubes in the kidney that filter the blood and remove waste products) and renal pelvis carcinoma (cancer that forms in the center of the kidney where urine collects). It also includes Wilms tumor, which is a type of kidney cancer that usually develops in children under the age of 5.</n0:def-definition><n0:def-source>NCI-GLOSS</n0:def-source></n0:ComplexDefinition>
<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>A carcinoma arising from the epithelium of the renal parenchyma (renal cell carcinoma) or the renal pelvis (renal pelvis carcinoma). The vast majority of renal cell carcinomas are adenocarcinomas. The vast majority of renal pelvis carcinomas are transitional cell carcinomas. Renal carcinomas usually affect middle aged and elderly adults. Hematuria, abdominal pain, and a palpable mass are common symptoms. -- 2004</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>