The kidneys are two bean-shaped organs found near the middle of your back, one on either side of your spine. The kidneys are part of your urinary system. They filter your blood to remove waste products from it and these are made into urine. Urine then drains into your bladder down tubes called ureters. You have two ureters – one from each kidney. Another tube, called the urethra, then carries urine from your bladder out of your body.
The kidneys also produce three important hormones (chemicals produced by your body).
The organs and tissues of your body are made up of cells. Usually, cells grow and divide in an orderly and controlled way. However, if this process gets out of control, the cells carry on growing and dividing and develop into a lump called a tumour. Tumours are either non-cancerous (benign) or cancerous (malignant).
Cancerous tumours can grow through your kidney and spread to other parts of your body (through your bloodstream or lymphatic system) where they may grow and form secondary tumours. Your lymphatic system is made up of the tissues and organs, including the bone marrow, spleen, thymus and lymph nodes, that produce and store cells that fight infection and disease. The spread of cancer is called metastasis.
Kidney cancer isn’t infectious and it can’t be passed on to other people. Usually, only one of your kidneys is affected – it’s rare for cancer to develop in both of your kidneys.
In the UK, about 7,800 people are diagnosed with kidney cancer each year. It’s the eighth most common cancer and affects more men than women. More people get kidney cancer when they are over 75. It’s rare for people under 40 to get kidney cancer, but there is a rare type called Wilms’ tumour (also known as nephroblastoma) that affects very young children.
There are several types of kidney cancer. Renal cell cancer (RCC) is the most common type of kidney cancer in adults. More than eight in 10 people with kidney cancer in the UK have this type. In RCC, the cancerous cells are found in the lining of your tubules (the smallest tubes inside your kidneys that help filter the blood and make urine).
There are several different types of RCC, but all of these are treated in the same way. The main ones are:
Another type of kidney cancer is called transitional cell cancer (TCC), which affects part of your kidney called the renal pelvis. This type of kidney cancer is less common. About eight in 100 people with kidney cancer in the UK have TCC. This type of cancer can develop in your bladder, as it affects the lining of your whole urinary system.
Another type of kidney cancer, called Wilms' tumour, can affect children. This is different from kidney cancer in adults and is uncommon – about 70 children in the UK develop Wilms' tumour each year. It most often affects children under five.
This factsheet will focus on RCC.
When kidney cancer first starts to develop, you won’t have any obvious symptoms. It’s sometimes picked up on ultrasound scans that are done for other reasons. When the cancer begins to grow, your symptoms can become more obvious.
Having blood in your urine is the most common symptom of kidney cancer. More often, blood in your urine is caused by an infection, an enlarged prostate (if you’re a man) or kidney stones. However, if you see blood in your urine, you should see your GP.
It’s possible that you might feel a lump or swelling in the area of your kidneys, although most kidney cancers are too small to feel.
Other symptoms of kidney cancer may include:
High blood pressure (hypertension) and anaemia (a condition in which your blood can't carry enough oxygen to meet the needs of your body) can also be signs of kidney cancer.
These symptoms aren't always caused by kidney cancer, but if you have them, see your GP.
The causes of kidney cancer aren't fully understood at present. However, several things are known to increase your risk of developing kidney cancer, including the following.
Your GP will ask you about your symptoms and examine you. He or she may test a sample of your urine with a dipstick and may also take a blood sample for testing.
If you have blood in your urine, you may be referred to a haematuria clinic. All the tests needed to make a diagnosis can usually be done at the same time and you can go home the same day.
Your GP may refer you to an urologist (a doctor who specialises in conditions that affect the urinary system) for further tests, which may include the following.
Your doctor will plan your treatment by taking into account several factors, including your age and general health, the type and size of the tumour, and whether it has spread.
Surgery is the main treatment for kidney cancer. If all of the cancer can’t be removed by surgery, other treatments may be used.
Early stages of kidney cancer are most likely to be curable with surgery. Your surgeon will either remove your whole kidney (radical nephrectomy) or just the affected part of your kidney (partial nephrectomy). Sometimes it may be possible to have keyhole surgery. In this operation, your surgeon uses a laparoscope (a fine tube with a camera attached) to remove some or all of your kidney. He or she makes only small cuts in your abdomen (tummy) instead of one larger cut.
There are other surgical treatments available, which may be suitable if you have smaller kidney tumours or if you aren’t healthy enough to have conventional surgery.
Radiotherapy uses X-rays to destroy cancer cells, while doing as little harm as possible to normal cells. You’re most likely to be offered this treatment to shrink your cancer if it’s causing you pain or to treat cancer that has spread to other parts of your body, such as your bones or brain.
Chemotherapy uses anticancer medicines to destroy cancer cells. It works by disrupting the growth of cancer cells. Chemotherapy isn't often used to treat RCC, but you might be offered it in combination with another treatment.
Biological therapy uses medicines based on substances produced by the body to kill cancer cells or stop them growing. You may be offered biological therapy if your kidney cancer has spread or if you’re at high risk of it coming back after having surgery to remove your tumour.
You may be able to reduce your risk of developing kidney cancer by making certain changes to your lifestyle, such as stopping smoking, losing excess weight and eating a healthy, balanced diet.
Being diagnosed with cancer can be distressing for you and your family. An important part of cancer treatment is having support to deal with the emotional aspects as well as the physical symptoms. Specialist cancer doctors and nurses are experts in providing the support you need, and may also visit you at home. If you have more advanced cancer, further support is available to you in hospices or at home – this is called palliative care.
Produced by Alice Rossiter, Bupa Health Information Team, March 2012.
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