Use of human glandular kallikrein 2 for the detection of prostate cancer: Preliminary analysis

Alan W. Partin, William J. Catalona, Judith A. Finlay, Claude Darte, Donald J. Tindall, Charles Y F Young, George G. Klee, Daniel W. Chan, Harry G. Rittenhouse, Robert L. Wolfert, David L. Woodrum*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

116 Scopus citations


Objectives. Human glandular kallikrein 2 (hK2) and prostate-specific antigen (PSA) are members of a multigene family of serine proteases that share approximately 80% sequence homology. Both are expressed in the prostate epithelium, are under androgen regulation, are present in serum and seminal fluid, and can form complexes with endogenous protease inhibitors (eg, alpha2-macroglobulin and alpha1-antichymotrypsin). Differences in immunohistochemistry and substrate specificity suggest hK2 may provide unique information for early detection and characterization of prostate cancer. Methods. Nine hundred thirty-seven archived serum samples from men treated at two academic institutions were studied. All men underwent biopsy, had a histologically confirmed diagnosis of cancer or noncancer, and a total PSA level greater than 2 ng/mL. Samples were tested in Hybritech's Tandem-R PSA and Tandem-R free PSA (fPSA) assays and a research prototype assay for total hK2 (thK2). Results. The thK2/fPSA ratio provided additional specificity for cancer detection over PSA and the percentage of fPSA (%fPSA). A model for cancer detection using %fPSA and the thK2/fPSA ratio when PSA is 2 to 4 ng/mL is proposed that would identify as many as 40% of the cancers and would require biopsy in only 16.5% of the men in this PSA range. Conclusions. In this study, %fPSA and thK2/fPSA provided unique information for prostate cancer detection and increased the specificity of cancer detection.

Original languageEnglish (US)
Pages (from-to)839-845
Number of pages7
Issue number5
StatePublished - Nov 1999

ASJC Scopus subject areas

  • Urology


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