KLK3 and prostate cancer: There are no currently available triage tests for brain cancer, but a commercial comparator for clinical benchmarking can be provided by the Select MDx test for prostate cancer (MDx Health).18 In a similar fashion to the use of the Dxcover® Brain Cancer liquid biopsy, this test is directed at symptomatic patients who have an abnormal prostate-specific antigen (PSA) level or abnormal digital rectal exam (DRE).