OBJECTIVE: Disease-associated isoforms of the prostate-specific antigen (PSA) have recently been identified. We evaluated the efficacy of using precursor isoforms of PSA (pPSA) and their ratios for the detection of prostate cancer. METHODS: Serum concentrations of [-2], [-4], and [-7]pPSA, BPSA, and free PSA (fPSA) were retrospectively measured in 43 selected men. Of the 43 men, 15 had clinical T2 prostate cancer with ultrasound-estimated prostate volumes (PVs) of >50 cm(3), 13 had clinical T2 prostate cancer with (PVs) <25 cm(3), and 15 were prostate cancer-free with PV >50 cm(3). We calculated sum pPSA ([-2]+[-4]+[-7]pPSA). We also compared the ratios of: free/total PSA, [-2]pPSA/fPSA, [-2]pPSA/BPSA, [-2]pPSA/(fPSA-BPSA), [-2]pPSA/(fPSA-sum pPSA), and [-2]pPSA/{fPSA-(sum pPSA+BPSA)} among these three groups. RESULTS: The median [-2]pPSA/(fPSA-sum pPSA) ratio was significantly higher in men with prostate cancer with or without large PV compared with men with large PV without prostate cancer. Values for median [-2]pPSA/free PSA ratio were higher in men with prostate cancer with or without large PV compared with men with large PV, and without prostate cancer, but the differences were not statistically significant. CONCLUSIONS: In this preliminary study, [-2]pPSA/(fPSA-sum pPSA) ratio was not associated with prostate gland volume but was associated with prostate cancer. This ratio may be useful in the detection of prostate cancer, particularly in men with larger glands.
OBJECTIVE: Disease-associated isoforms of the prostate-specific antigen (PSA) have recently been identified. We evaluated the efficacy of using precursor isoforms of PSA (pPSA) and their ratios for the detection of prostate cancer. METHODS: Serum concentrations of [-2], [-4], and [-7]pPSA, BPSA, and free PSA (fPSA) were retrospectively measured in 43 selected men. Of the 43 men, 15 had clinical T2 prostate cancer with ultrasound-estimated prostate volumes (PVs) of >50 cm(3), 13 had clinical T2 prostate cancer with (PVs) <25 cm(3), and 15 were prostate cancer-free with PV >50 cm(3). We calculated sum pPSA ([-2]+[-4]+[-7]pPSA). We also compared the ratios of: free/total PSA, [-2]pPSA/fPSA, [-2]pPSA/BPSA, [-2]pPSA/(fPSA-BPSA), [-2]pPSA/(fPSA-sum pPSA), and [-2]pPSA/{fPSA-(sum pPSA+BPSA)} among these three groups. RESULTS: The median [-2]pPSA/(fPSA-sum pPSA) ratio was significantly higher in men with prostate cancer with or without large PV compared with men with large PV without prostate cancer. Values for median [-2]pPSA/free PSA ratio were higher in men with prostate cancer with or without large PV compared with men with large PV, and without prostate cancer, but the differences were not statistically significant. CONCLUSIONS: In this preliminary study, [-2]pPSA/(fPSA-sum pPSA) ratio was not associated with prostate gland volume but was associated with prostate cancer. This ratio may be useful in the detection of prostate cancer, particularly in men with larger glands.
Authors: Yuanyuan Liang; Donna P Ankerst; Norma S Ketchum; Barbara Ercole; Girish Shah; John D Shaughnessy; Robin J Leach; Ian M Thompson Journal: J Urol Date: 2010-11-12 Impact factor: 7.450
Authors: Brian V Le; Christopher R Griffin; Stacy Loeb; Gustavo F Carvalhal; Donghui Kan; Nikola A Baumann; William J Catalona Journal: J Urol Date: 2010-02-19 Impact factor: 7.450
Authors: Lori J Sokoll; Martin G Sanda; Ziding Feng; Jacob Kagan; Isaac A Mizrahi; Dennis L Broyles; Alan W Partin; Sudhir Srivastava; Ian M Thompson; John T Wei; Zhen Zhang; Daniel W Chan Journal: Cancer Epidemiol Biomarkers Prev Date: 2010-05 Impact factor: 4.254
Authors: William J Catalona; Alan W Partin; Martin G Sanda; John T Wei; George G Klee; Chris H Bangma; Kevin M Slawin; Leonard S Marks; Stacy Loeb; Dennis L Broyles; Sanghyuk S Shin; Amabelle B Cruz; Daniel W Chan; Lori J Sokoll; William L Roberts; Ron H N van Schaik; Isaac A Mizrahi Journal: J Urol Date: 2011-03-17 Impact factor: 7.450
Authors: Lori J Sokoll; Yinghui Wang; Ziding Feng; Jacob Kagan; Alan W Partin; Martin G Sanda; Ian M Thompson; Daniel W Chan Journal: J Urol Date: 2008-06-11 Impact factor: 7.450