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Prostate Cancer - Introduction
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Prostate Cancer - Introduction |
Introduction
Prostate cancer is an abnormal, uncontrolled growth of cells that results in the formation of a tumor in the prostate gland. Prostate, the walnut sized gland is a part of the reproductive system which lies deep in the pelvis. It is located in front of the rectum and underneath the urinary bladder and surrounds the urethra, (the urine tube running from the bladder, through the prostate and the penis). It contains gland cells that produce some of the seminal fluid, which protects and nourishes sperm cells in semen and supports the ejaculatory ducts, or sperm tubes. The prostate continues to grow till a man reaches adulthood and is maintained after it reaches normal size as long as male hormones are produced.
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Prostate cancer begins most often in the outer part of the prostate. It is the most common cancer in men older than age 50. In most men, the cancer grows very slowly. In fact, many men with the disease will never know they have the condition. Early prostate cancer is confined to the prostate gland itself, and the majority of patients with this type of cancer can live for years with no problems. In some cases, it may spread from the prostate to nearby lymph nodes, bones or other organs. This spread is called metastasis. Most Prostate cancers originate in the posterior prostate gland, the rest originate near the urethra.
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Symptoms
Early prostate cancer usually causes no symptoms. Often it is diagnosed during the workup for an elevated PSA noticed during a routine checkup. Sometimes, however, prostate cancer does cause symptoms, often similar to those of diseases such as benign prostatic hypertrophy. These include frequent urination, increased urination at night, difficulty starting and maintaining a steady stream of urine, blood in the urine, and painful urination.
Prostate cancer is associated with urinary dysfunction as the prostate gland surrounds the prostatic urethra. Changes within the gland therefore directly affect urinary function. Because the vas deferens deposits seminal fluid into the prostatic urethra, and secretions from the prostate gland itself are included in semen content, prostate cancer may also cause problems with sexual function and performance, such as difficulty achieving erection or painful ejaculation.
Advanced prostate cancer
Advanced prostate cancer can spread to other parts of the body and this may cause additional symptoms. The most common symptom is bone pain, often in the vertebrae (bones of the spine), pelvis or ribs. Spread of cancer into other bones such as the femur is usually to the proximal part of the bone. Prostate cancer in the spine can also compress the spinal cord, causing leg weakness and urinary and fecal incontinence.
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