Difference between revisions of "Prostate-specific antigen"
Jump to navigation
Jump to search
| Line 15: | Line 15: | ||
:Abbreviated ''PSAD''. | :Abbreviated ''PSAD''. | ||
Normal is often considered to be: <0.15 ng/ml. | |||
*Approximately 8% of individuals below the cut-point (0.15 ng/ml) have medium or high-grade cancer.<ref name=pmid12973074>{{Cite journal | last1 = Boulos | first1 = MT. | last2 = Rifkin | first2 = MD. | last3 = Ross | first3 = J. | title = Should prostate-specific antigen or prostate-specific antigen density be used as the determining factor when deciding which prostates should undergo biopsy during prostate ultrasound. | journal = Ultrasound Q | volume = 17 | issue = 3 | pages = 177-80 | month = Sep | year = 2001 | doi = | PMID = 12973074 }} | |||
</ref> | </ref> | ||
*In another series, 48% of individuals with cancer had a PSAD >0.15 ng/ml.<ref name=pmid22482342>{{Cite journal | last1 = Aganovic | first1 = D. | last2 = Prcic | first2 = A. | last3 = Kulovac | first3 = B. | last4 = Hadziosmanovic | first4 = O. | title = Influence of the prostate volume, prostate specific antigen density and number of biopsy samples on prostate cancer detection. | journal = Med Arh | volume = 66 | issue = 1 | pages = 41-4 | month = | year = 2012 | doi = | PMID = 22482342 }} | |||
</ref> | </ref> | ||
*Difference between races have been noted; in those without prostate cancer:<ref name=pmid8998182/> | |||
**0.19 +/- 0.03 ng/ml (blacks). | |||
**0.11 +/- 0.01 ng/ml (whites). | |||
Better predictor than (unadjusted) serum PSA for: | Better predictor than (unadjusted) serum PSA for: | ||
Revision as of 16:40, 22 October 2014
Prostate specific antigen, abbreviated PSA, is marker that is quite specific for the prostate.
General
- Quantity in the serum used to screen for prostate cancer.
- PSA immunostain useful for classifying a carcinoma as prostate carcinoma.
Serum PSA
- Normal - typically <= 4.0 ng/mL.
- Sensitivity: 82% (whites), 90% (blacks).[1]
- Specificity: 52% (whites), 38% (blacks).[1]
- Increases with age.[2]
Prostate specific antigen density
- Abbreviated PSAD.
Normal is often considered to be: <0.15 ng/ml.
- Approximately 8% of individuals below the cut-point (0.15 ng/ml) have medium or high-grade cancer.[3]
- In another series, 48% of individuals with cancer had a PSAD >0.15 ng/ml.[4]
- Difference between races have been noted; in those without prostate cancer:[1]
- 0.19 +/- 0.03 ng/ml (blacks).
- 0.11 +/- 0.01 ng/ml (whites).
Better predictor than (unadjusted) serum PSA for:
- Gleason score upgrading on prostatectomy.[5]
- Benign prostate gland versus prostate cancer.[6][7]
A forumla for PSAD
Benson et al.:[6]
Where:
- .[8]
- H, W, L are the height, width and length.
An alternate estimation of the volume is:
- .
- D1, D2, D3 are the major axes.
Note:
- The volume of an ellipsoid is:
- .
See also
References
- ↑ 1.0 1.1 1.2 Henderson, RJ.; Eastham, JA.; Culkin, DJ.; Kattan, MW.; Whatley, T.; Mata, J.; Venable, D.; Sartor, O. (Jan 1997). "Prostate-specific antigen (PSA) and PSA density: racial differences in men without prostate cancer.". J Natl Cancer Inst 89 (2): 134-8. PMID 8998182.
- ↑ Ku JH, Ahn JO, Lee CH, et al. (September 2002). "Distribution of serum prostate-specific antigen in healthy Korean men: influence of ethnicity". Urology 60 (3): 475–9. PMID 12350489.
- ↑ Boulos, MT.; Rifkin, MD.; Ross, J. (Sep 2001). "Should prostate-specific antigen or prostate-specific antigen density be used as the determining factor when deciding which prostates should undergo biopsy during prostate ultrasound.". Ultrasound Q 17 (3): 177-80. PMID 12973074.
- ↑ Aganovic, D.; Prcic, A.; Kulovac, B.; Hadziosmanovic, O. (2012). "Influence of the prostate volume, prostate specific antigen density and number of biopsy samples on prostate cancer detection.". Med Arh 66 (1): 41-4. PMID 22482342.
- ↑ Sfoungaristos S, Katafigiotis I, Perimenis P (2013). "The role of PSA density to predict a pathological tumour upgrade between needle biopsy and radical prostatectomy for low risk clinical prostate cancer in the modified Gleason system era". Can Urol Assoc J 7 (11-12): E722–7. doi:10.5489/cuaj.374. PMC 3840515. PMID 24282465. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3840515/.
- ↑ 6.0 6.1 Benson MC, Whang IS, Pantuck A, et al. (March 1992). "Prostate specific antigen density: a means of distinguishing benign prostatic hypertrophy and prostate cancer". J. Urol. 147 (3 Pt 2): 815–6. PMID 1371554.
- ↑ Verma A, St Onge J, Dhillon K, Chorneyko A (June 2014). "PSA density improves prediction of prostate cancer". Can J Urol 21 (3): 7312–21. PMID 24978363.
- ↑ Eri, LM.; Thomassen, H.; Brennhovd, B.; Håheim, LL. (2002). "Accuracy and repeatability of prostate volume measurements by transrectal ultrasound.". Prostate Cancer Prostatic Dis 5 (4): 273-8. doi:10.1038/sj.pcan.4500568. PMID 12627211.