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Prostate cancer is a common type of cancer in men that starts in the prostate gland (a collection of male sex glands encased as one walnut-sized organ). The prostate gland is located just below the bladder (the organ that collects and empties urine) and surrounds the urethra (the tube that carries urine from the bladder through the penis). The prostate produces fluid that becomes part of the semen and helps to control the rate and flow of urination.
Prostate cancer occurs when cells within the prostate glands begin to grow and divide abnormally. If left untreated, the cancer will gradually spread to surrounding tissues (this spreading process is called metastasis) — first, to the lymph nodes, which drain the prostate and then to the bones, usually the spine and ribs. Prostate cancer generally develops very slowly, although it can grow quickly and spread to other parts of the body. If the cancer is found before it has spread outside the prostate, the survival rate is excellent. The survival rate decreases if the cancer has spread to tissues surrounding the prostate or to elsewhere in the body.
The cause of prostate cancer is not yet known, but there are certainly risk factors associated with developing the disease. These include:
In the early stages, the symptoms of prostate cancer may be mild and go unnoticed. However, as the disease progresses, you may experience the following symptoms:
There is no screening programme for prostate cancer available in Ireland at present, as there is debate on the effectiveness of regular screening for all men. However, it is important that you are checked by your doctor if you have any of the symptoms of prostate cancer, and that you have regular check-ups if you are over the age of 50 if you have a family history of breast or prostate cancer.
At present, there is no single test to diagnose prostate cancer, so a number of tests must be done. Initial tests your GP may carry out include a rectal examination and a blood test to check your level of a protein called prostate specific antigen (PSA).
In the digital rectal examination, the doctor will insert a gloved lubricated finger into the rectum (back passage) to feel the prostate for bumps or nodules. This is a quick test and will not be painful, but may just be slightly uncomfortable.
The PSA test involves taking samples of blood to check the level of PSA. Men with prostate cancer tend to have higher levels of PSA in their blood; however, a raised PSA does not necessarily mean you have prostate cancer. Likewise, men with prostate cancer do not always have a raised PSA. Your doctor will therefore refer you for further tests at a hospital if they have any cause for concern.
Transrectal ultrasound and biopsy
Following a PSA test and digital rectal exam, you may be referred to a hospital to have a biopsy. This involves taking a microscopic sample of the prostate tissue with a needle through the rectum and is often carried out at the same time as the transrectal ultrasound (TRUS) test. The TRUS test uses a small lubricated metal tube placed in your back passage to take an image of the inside of your body. The biopsy, together with the TRUS test, will normally reveal whether you have prostate cancer and how quickly it may develop.
If you are diagnosed with prostate cancer, you may need further tests to show whether the disease has spread to other parts of the body. These may include a bone scan, bone x-ray, CT scan and an MRI scan.
A grading system is used to describe the appearance of cancer cells under the microscope, and predict how the cancer will grow. Different grading systems may be used, although the Gleason grading system is most common. This system gives a score of 2-10, with the higher the number the more likely the tumour is to grow and spread. Ask your doctor to explain what the grade on your biopsy result means.
Staging indicates the size and location of the cancer, and is very important in deciding the best treatment for you. Early-stage tumours are contained within the prostate gland, while late-stage tumours may have spread beyond the prostate into surrounding tissues. Cancer that has spread to other parts of the body is known as secondary or metastatic prostate cancer.
Again, different staging systems are used, so ask your doctor to explain what the staging on your biopsy result means.
There are a number of different treatments available for prostate cancer, which may be used on their own or in combination. Which treatment you are given will depend on a number of factors, including your age, overall health and the stage and grade of your cancer, as well as your own personal preference. The earlier the cancer is detected, the greater the chance that treatment will be effective.
Also referred to as ‘conservative management’ or ‘expectant therapy’, this option may be recommended by your doctor if your cancer is at a very early stage, is expected to grow very slowly and is not causing any symptoms. Your doctor may feel that aggressive treatment would be more stressful than beneficial (for older people who have other health problems, for example). The progress of your cancer will be closely monitored with regular blood tests and check-ups, and active treatment recommended if it begins to change or cause problems.
The most common surgery for prostate cancer is the total prostatectomy (also known as a radical prostatectomy). This procedure involves removing the entire prostate gland and some the tissue around it from the body. It is usually recommended for young men with a relatively early-stage tumour that is confined to the prostate, as removing the prostate will then removes the entire tumour, curing the cancer.
After the surgery, a temporary catheter (tube to drain urine) will be inserted through the penis into the bladder, which will allow you to urinate easily while you are healing. This remains in place for three weeks after the operation. You will be able to urinate on your own when the catheter is removed. Most men are ready to go home 7 to 10 days after surgery.
The main long-term side-effects of surgery are urinary incontinence (loss of bladder control) and erectile dysfunction (or impotence – failure to achieve and sustain an erection), and the severity of these side-effects will vary from individual to individual. Most men are likely to have some problems when the catheter is first removed, but this usually improves with time. Normal bladder control will usually return within several weeks or months — ask your doctor about pelvic exercises that will strengthen your muscles. Again, the degree of impotence suffered will depend on your age, the type of surgery that was performed and whether any nerves were damaged or removed. You may need to take medication or use mechanical aids to achieve an erection for a period following the operation. You will still orgasm, although there will not be any semen.
Another type of surgery that is sometimes carried out for prostate cancer is called transurethral resection of the prostate (TURP). This involves removal of the diseased section of the prostate only, and not the whole gland. It may be carried out in men who cannot have a total prostatectomy due to age or illness. TURP does not require the same length of hospital stay as the radical procedure. Neither does it have the same level of risk of side effects such as incontinence and impotence.
Cryosurgery (or cryotherapy) uses cryogenic gases to freeze and destroy the cancer. The treatment is normally used in men with early-stage prostate cancer who want to avoid surgery, or in men whose disease has come back after radiotherapy. As with a prostatectomy, a temporary catheter is inserted after the procedure. New techniques have helped to reduce side effects with this treatment, such as erectile and urinary dysfunction. However, long-term benefits or drawbacks of this therapy are still being evaluated.
Radiotherapy may be used to treat cancer that has not spread outside the prostate gland or has spread only to nearby tissue. High-energy x-rays are used to shrink or kill the cancer cells. Radiotherapy may also be used to alleviate pain when cancer has spread to the bone. This treatment does not guarantee that surgery will not be necessary at a later date.
Two types of radiation therapy are used for treating prostate cancer:
The male sex hormone testosterone fuels the growth of prostate cancer cells. By blocking the effects of testosterone the growth of prostate cancer cells can be slowed down. This is achieved through the use of hormones that oppose the effects of testosterone. A variety of hormones are available which can be administered in the form of a tablet or injection. Hormonal therapy may also involve an operation to remove the testes – this is called an orchidectomy. This option avoids having to use drugs, but may not be suitable for everyone.
Hormonal therapy can shrink the tumour and symptoms often fully disappear. This is the standard treatment for prostate cancer that has spread to other parts of the body. Unfortunately, most hormonal therapies usually cause erectile dysfunction and loss of sexual desire; however some drugs are more likely to cause side effects than others. You may also be able to receive treatment in intervals of 3 or 4 months at a time.
Chemotherapy is drug-treatment, which may be given as an injection or infusion (drip), or in tablet form. Depending on the type you need, you may have to stay in hospital overnight, or it may be given in day care.
Chemotherapy is used if there is evidence of cancer spreading beyond the prostate gland, which cannot be controlled by hormone therapy. These cancer cells act almost like seedlings from a plant and can set up secondary cancer sites beyond the prostate gland. Prostate cancer has a tendency to spread to bone. Chemotherapy helps to suppress the growth of such bone deposits. Tumour deposits in bone can be painful and chemotherapy is often used to assist in pain relief. By suppressing the growth of cancer cells in bone the overall level of pain can be reduced.
Reviewed: October 4, 2006
Last Reviewed: 4th October 2006