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The effect of assessing genetic risk of prostate cancer on the use of PSA tests in primary care: a cluster randomized controlled trial

Fredsøe, Jacob, Koetsenruijter, Jan, Vedsted, Peter, Kirkegaard, Pia, Vaeth, Michael, Edwards, Adrian ORCID:, Orntoft, Torben F., Sorensen, Karina D. and Bro, Fleming 2020. The effect of assessing genetic risk of prostate cancer on the use of PSA tests in primary care: a cluster randomized controlled trial. PLoS Medicine 17 (2) , e1003033. 10.1371/journal.pmed.1003033

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Background Assessing genetic lifetime risk for prostate cancer has been proposed as a means of risk stratification to identify those for whom prostate-specific antigen (PSA) testing is likely to be most valuable. This project aimed to test the effect of introducing a genetic test for lifetime risk of prostate cancer in general practice on future PSA testing. Methods and findings We performed a cluster randomized controlled trial with randomization at the level of general practices (73 in each of two arms) in the Central Region (Region Midtjylland) of Denmark. In intervention practices, men were offered a genetic test (based on genotyping of 33 risk-associated single nucleotide polymorphisms) in addition to the standard PSA test that informed them about lifetime genetic risk of prostate cancer and distinguished between “normal” and “high” risk. The primary outcome was the proportion of men having a repeated PSA test within 2 years. A multilevel logistic regression model was used to test the association. After applying the exclusion criteria, 3,558 men were recruited in intervention practices, with 1,235 (34.7%) receiving the genetic test, and 4,242 men were recruited in control practices. Men with high genetic risk had a higher propensity for repeated PSA testing within 2 years than men with normal genetic risk (odds ratio [OR] = 8.94, p < 0.01). The study was conducted in routine practice and had some selection bias, which is evidenced by the relatively large proportion of younger and higher income participants taking the genetic test. Conclusions Providing general practitioners (GPs) with access to a genetic test to assess lifetime risk of prostate cancer did not reduce the overall number of future PSA tests. However, among men who had a genetic test, knowledge of genetic risk significantly influenced future PSA testing.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Additional Information: This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Publisher: Public Library of Science
ISSN: 1549-1277
Date of First Compliant Deposit: 20 January 2020
Date of Acceptance: 15 January 2020
Last Modified: 17 Nov 2023 20:33

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