Word: assays
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Dates: during 1991-1991
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...basis for the new assay, PSA, is a protein produced by cells on the surface of the prostate and thought to play a role in preventing semen from coagulating. An enlarged prostate (due to cancer or other problems) leads to higher levels of PSA in the blood. Doctors already use PSA tests to monitor the effectiveness of prostate-cancer therapies, such as irradiation or hormonal treatments. Some researchers have argued that the exams should replace much more expensive bone scans as a way of determining how far the cancer has spread...