Prostate-specific antigen

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Prostate-specific antigen (PSA) is a protein produced by both normal and malignant cells of the prostate gland. The PSA test measures the level of PSA in a man's blood and is used as a screening tool for prostate cancer, as well as to monitor the effectiveness of treatment for prostate cancer and to detect recurrence after treatment. Despite its widespread use, the PSA test has been the subject of debate regarding its benefits and risks.

Overview

PSA is a serine protease that is secreted by the epithelial cells of the prostate gland. Its physiological role is to liquefy semen following ejaculation, facilitating the movement of sperm. In the context of prostate cancer screening, the level of PSA in the blood can be elevated in men with the disease. However, elevated PSA levels can also be observed in benign conditions such as benign prostatic hyperplasia (BPH) and prostatitis, making the test less specific for prostate cancer.

PSA Testing

The PSA test is a blood test that measures the concentration of prostate-specific antigen in the blood. Recommendations for PSA screening vary among medical organizations, with some advocating for routine screening in men of certain age groups and others recommending against routine screening due to concerns about overdiagnosis and overtreatment of prostate cancers that may never become clinically significant.

Screening

Screening for prostate cancer using the PSA test involves measuring the level of PSA in the blood and, depending on the result, possibly undergoing further diagnostic procedures, such as a prostate biopsy. The decision to undergo PSA screening should be based on a discussion between a man and his healthcare provider that includes consideration of the potential benefits and risks.

Diagnosis and Monitoring

In addition to its role in screening, the PSA test is used to monitor men who have been diagnosed with prostate cancer. PSA levels can provide information about the effectiveness of treatment and can help in detecting recurrence of the disease.

Controversies and Considerations

The use of PSA testing for prostate cancer screening is controversial. Critics argue that it may lead to overdiagnosis and overtreatment of cancers that would not have caused harm during a man's lifetime. Overdiagnosis can result in unnecessary treatments, which can have significant side effects, such as erectile dysfunction and urinary incontinence. Proponents of PSA testing, however, believe that it can save lives by detecting cancer early when treatment is more likely to be successful.

Conclusion

The PSA test is an important tool in the detection and management of prostate cancer, but its use as a screening tool must be carefully considered. Men should discuss the potential benefits and risks of PSA screening with their healthcare provider to make an informed decision that reflects their values and preferences.

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