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12

NCCN Guidelines for Patients

®

:

Kidney Cancer, Version 1.2017

1

Kidney cancer basics

How does kidney cancer start?

Where does kidney cancer start?

Almost all kidney cancers are carcinomas.

Carcinomas are cancers that start in cells that

line the inner or outer surfaces of the body. In the

kidneys, carcinomas most often start in the cells that

line the renal tubules. This is called RCC (

r

enal

c

ell

c

arcinoma) and it is the focus of this patient book.

About 90 out of 100 kidney cancers are RCCs.

See

Figure 5

. Because it is the most common type,

RCC is often simply referred to as kidney cancer.

There are three other, less common types of cancer

that start in the kidneys. However, they do not act the

same as RCC and are not treated the same as RCC.

The less common types of kidney cancer are:

†

†

TCC (

t

ransitional

c

ell

c

arcinoma)

†

†

Wilms tumor

†

†

Renal sarcoma

TCC starts in the cells that line the renal pelvis.

Wilms tumor almost only occurs in young children.

Renal sarcoma starts in the blood vessels or

connective tissue of the kidneys. (For information

about sarcomas, read

NCCN Guidelines for Patients:

Soft Tiss

ue Sarcoma

, available at

www.nccn.org/ patients .

)

Figure 5

Common types of kidney cancer

RCC is the most common type of

kidney cancer. About 90 out of 100

kidney cancers are RCCs. TCC

accounts for about 5 to 10 out of

100 kidney cancers. Renal sarcoma

accounts for less than 1 out of 100.

Wilms tumor is very rare and almost

only occurs in young children.

Types of kidney cancer

RCC

Other

Illustration Copyright © 2017 National Comprehensive Cancer Network

®

(NCCN

®

).