Prospective evaluation of prostate specific antigen and prostate specific antigen density in the detection of carcinoma of the prostate: ethnic variations.

PURPOSE We evaluated prospectively the ethnic variations in prostate specific antigen (PSA) and prostate specific antigen density in the detection of carcinoma of the prostate. MATERIALS AND METHODS A total of 297 consecutive patients with an elevated serum PSA and/or abnormal digital rectal examination underwent transrectal ultrasound with lesion directed and systematic biopsy (6 if the prostatic volume was 50 cc or less and 12 if it was greater than 50 cc). Receiver operating characteristic curves, predictive values and likelihood ratios were calculated for PSA and PSA density for white and black patients. Ethnic analysis was performed for the entire group, patients with a normal digital rectal examination, and those with a normal digital rectal examination and PSA of 4 to 10 ng./ml. RESULTS Of the 297 patients 131 (44%) had cancer, including 48 of 97 black (50%) and 83 of 200 white (42%) patients. Median PSA, PSA density and prostate size did not differ between the positive or negative biopsy groups, or between the ethnic groups in any of the analyses. If all digital rectal examinations were considered PSA density was superior to PSA by receiver operating characteristic analysis for cancer detection in both ethnic groups when all values or PSA of 4 to 10 ng./ml. were considered. However, the significance was lost if only patients with a normal digital rectal examination were considered. In general, predictive values were greater in black patients. Likelihood ratios for a negative test result in black patients demonstrated significant changes in the post-test probability if a PSA density cutoff of 0.1 was used to determine the need for biopsy. Many unnecessary biopsies could be avoided and few cancers would be missed. CONCLUSIONS A PSA density cutoff of 0.1 may be warranted in determining the need for prostate biopsy in black men with a normal digital rectal examination.

[1]  W. Ellis,et al.  The inability of prostate specific antigen index to enhance the predictive the value of prostate specific antigen in the diagnosis of prostatic carcinoma. , 1993, The Journal of urology.

[2]  M M Elhilali,et al.  Prospective evaluation of prostate-specific antigen density and systematic biopsies for early detection of prostatic carcinoma. , 1994, Urology.

[3]  J. Richie,et al.  Comparison of prostate specific antigen concentration versus prostate specific antigen density in the early detection of prostate cancer: receiver operating characteristic curves. , 1994, The Journal of urology.

[4]  J. Moul,et al.  Age-specific reference ranges for serum prostate-specific antigen in black men. , 1996, The New England journal of medicine.

[5]  T. P. Ball,et al.  The lack of predictive value of prostate specific antigen density in the detection of prostate cancer in patients with normal rectal examinations and intermediate prostate specific antigen levels. , 1995, The Journal of urology.

[6]  F. Mostofi,et al.  Prostate-specific antigen values at the time of prostate cancer diagnosis in African-American men. , 1995, JAMA.

[7]  D. Grignon,et al.  High grade prostatic intraepithelial neoplasia (HGPIN) and prostatic adenocarcinoma between the ages of 20-69: an autopsy study of 249 cases. , 1994, In vivo.

[8]  G. Guyatt,et al.  Users' Guides to the Medical Literature: III. How to Use an Article About a Diagnostic Test: B. What Are the Results and Will They Help Me In Caring for My Patients? , 1994 .

[9]  D. Grignon,et al.  EPIDEMOLOGY OF HIGH GRADE PROSTATIC INTRAEPITHELIAL NEOPLASIA , 1995 .

[10]  G. Guyatt,et al.  Users' guides to the medical literature. , 1993, JAMA.

[11]  Fagan Tj.  Letter: Nomogram for Bayes theorem. , 1975 .