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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.
PAP immunohistochemical staining is often used with PSA (staining), by pathologists, to help distinguish poorly differentiated carcinomas.For example, poorly differentiated prostate adenocarcinoma (prostate cancer) and urothelial carcinoma (bladder cancer) may appear similar under the microscope, but PAP and PSA staining can help differentiate them; [7] prostate adenocarcinoma often stains ...
Prostate-specific antigen. Prostate-specific antigen (PSA) is secreted by the epithelial cells of the prostate gland and can be detected in a sample of blood. [14] PSA is present in small quantities in the serum of men with healthy prostates, but is often elevated in the presence of prostate cancer or other prostate disorders. [15]
When PSA screening began in the 1980s, cases of prostate cancer rose by 26% between 1986-2005, with the most affected age group being men under the age of 50. [37] Prostate cancer is a heterogeneous disease, and the cancer will grow aggressively in approximately 1 in 3 cases. Therefore there is a risk of overdiagnosing and overtreating, this ...
Prostate cancer is the uncontrolled growth of cells in the prostate, a gland in the male reproductive system below the bladder.Abnormal growth of prostate tissue is usually detected through screening tests, typically blood tests that check for prostate-specific antigen (PSA) levels.
When sperm cells are not present, a second confirmatory test, the p30/PSA test, is performed. [3] PSA(p30) is known as a prostate-specific antigen that is produced by the prostatic gland in males. [9] The p30/PSA test is an immunochromatographic test that detects the presence of the antigen p30 in semen samples.
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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 ...