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Renal cell cancer (renal adenocarcinoma or hypernephroma) is the most common type of kidney cancer in adults. More than 8 in every 10 (80%) kidney cancers diagnosed in the UK are this type. In renal cell cancer the cancerous cells start in the lining of the tubules (the smallest tubes inside the nephrons) that help filter the blood and make urine.
There are several types of renal cell cancer - the main ones are:
All these types of renal cell cancer may also occur in a different form, known as sarcomatoid type.
Often kidney cancers contain more than one of these cell types. If a kidney cancer is a sarcomatoid type it may have a worse outlook than non sarcomatous kidney cancers.