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Prostate-specific antigen (PSA), also known as gamma-seminoprotein or kallikrein-3 (KLK3), P-30 antigen, is a glycoprotein enzyme encoded in humans by the KLK3 gene.PSA is a member of the kallikrein-related peptidase family and is secreted by the epithelial cells of the prostate gland in men and the paraurethral glands in women.
Used in conjunction with a PSA test, the PSE test boosts accuracy from 55% to 94% offering a more effective and precise method for detecting and diagnosing prostate cancer. [45] The 4Kscore combines total, free and intact PSA together with human kallikrein 2. [46] It is used to try to determine the risk of a Gleason score greater than 6. [46]
In a separate study of men from the pre prostate cancer screening era managed with watchful waiting (56% over age 70 years), progression to distant metastasis or prostate cancer death was 13.9% and 12.3%, respectively for Gleason score 6 or below, but considerably higher at 18.2 and 22.7%, 30% and 20%, 44.4% and 55.6% for Gleason 3+4, 4+3, and ...
It is typically performed when the result from a PSA blood test is high. [1] It may also be considered advisable after a digital rectal exam (DRE) finds possible abnormality. PSA screening is controversial as PSA may become elevated due to non-cancerous conditions such as benign prostatic hyperplasia (BPH), by infection, or by manipulation of ...
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As a result of these concerns, the adoption of third-party grading companies became progressively more widespread. PSA was able to benefit from the dot-com boom, which had eBay prevail as an online auction website. As a result, a larger number of individuals were able to participate in the sports card collecting and trading hobby.
After surgery or radiation therapy, PSA may start to rise again, which is called biochemical recurrence if a certain threshold is met in PSA levels (typically 0.1 or 0.2 ng/ml for surgery). At 10 years of follow-up after surgery, there is an overall risk of biochemical recurrence of 30–50%, depending on the initial risk state, and salvage ...
While many screening tests (such as the fecal occult blood test or PSA test) are non-invasive, it is important to note that mammography (breast cancer screening) involves ionizing radiation exposure. [10] The breast is highly radiation sensitive, and it receives an approximate dose of 2.6 milligrays per mammography screening. [11]
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