Hereditary kidney cancer may only constitute 5-10 % of all kidney cancers. For details on hereditary kidney cancers, see the Other Hereditary Kidney Cancer Syndromes section.
Non-hereditary RCC is called sporadic. Sporadic kidney cancer can be clear cell, papillary, chromophobe, medullary, transitional cell, collecting duct, oncocytic or have sarcomatoid features. It may also be called unclassified or mixed. Sporadic kidney cancer occurs because of a sporadic mutation and may possibly be related to obesity, smoking, or exposure to certain chemicals.
