Impact of age, benign prostatic hyperplasia, and cancer on prostate-specific antigen level.
BACKGROUND
The distribution of prostate-specific antigen (PSA) values for men with or without prostate carcinoma are confounded because of verification bias. Correcting for verification bias, the means and variances of PSA values were estimated in specific clinical scenarios.


METHODS
Existing receiver operating characteristic (ROC) curves, adjusted for the presence of verification bias in a screening population, were used to estimate the mean and variance of PSA values for men with or without prostate carcinoma, stratified by age and the presence or absence of benign prostatic hyperplasia. Men with a suspicious digital rectal exam (nodular) were excluded from analysis.


RESULTS
Among men with cancer and the absence of benign prostatic hyperplasia, mean PSA values were 2.05 ng/mL and 2.66 ng/mL for younger (<60 yr) and older (> or =60 yrs) men, respectively. These estimates were 2.56 ng/mL and 3.90 ng/mL in the presence of benign prostatic hyperplasia for younger and older men, respectively. For men without prostate carcinoma, these values were 0.78 ng/mL and 1.23 ng/mL for younger and older men, respectively, among those without benign prostatic hyperplasia, and 0.97 ng/mL and 1.75 ng/mL for younger and older men, respectively, among those with benign prostatic hyperplasia.


CONCLUSIONS
Accurate estimates of the mean and variance of PSA values for men with or without cancer may provide PSA thresholds for biopsy that are specific for age and prostate size as assessed by digital rectal exam. Therefore, the current threshold of 4.0 ng/mL should not be applied indiscriminately.
Punglia
Rinaa S
RS
Department of Radiation Oncology, Brigham and Women's Hospital, Boston, MA 02115, USA.
D'Amico
Anthony V
AV
Catalona
William J
WJ
Roehl
Kimberly A
KA
Kuntz
Karen M
KM
D000367:Age Factors; D000368:Aged; D002277:Carcinoma / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D017430:Prostate-Specific Antigen / Q000097:blood*; D011470:Prostatic Hyperplasia; D011471:Prostatic Neoplasms / Q000473:pathology*; D012016:Reference Values; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D017430:Prostate-Specific Antigen