Difference between revisions of "Prostate-specific antigen"

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====A forumla for PSAD====
====A forumla for PSAD====
*Benson ''et al.'':<ref name=pmid1371554>{{cite journal |author=Benson MC, Whang IS, Pantuck A, ''et al.'' |title=Prostate specific antigen density: a means of distinguishing benign prostatic hypertrophy and prostate cancer |journal=J. Urol. |volume=147 |issue=3 Pt 2 |pages=815–6 |year=1992 |month=March |pmid=1371554 |doi= |url=}}</ref>
Benson ''et al.'':<ref name=pmid1371554>{{cite journal |author=Benson MC, Whang IS, Pantuck A, ''et al.'' |title=Prostate specific antigen density: a means of distinguishing benign prostatic hypertrophy and prostate cancer |journal=J. Urol. |volume=147 |issue=3 Pt 2 |pages=815–6 |year=1992 |month=March |pmid=1371554 |doi= |url=}}</ref>
:<math>PASD = \frac{serum PSA}{volume}</math>
:<math>PASD = \frac{serum PSA}{volume}</math>
*Where:
 
:<math>volume = \frac{1}{2} D1 x D2 x D3</math>
Where:
:<math>volume = \frac{1}{2} D1 \times D2 \times D3</math>.
:D1, D2, D3 are the major axes.
:D1, D2, D3 are the major axes.


Note:
Note:
*The volume of an ellipsoid is:
*The volume of an ellipsoid is:
::<math>\frac{4}{3}\pi D1 x D1 x D3</math>
::<math>\frac{4}{3}\pi D1 \times D1 \times D3</math>.


==See also==
==See also==

Revision as of 04:26, 30 July 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.
  • Increases with age.[1]

Prostate specific antigen density

  • Abbreviated PSAD.

Better predictor than (unadjusted) serum PSA for:

A forumla for PSAD

Benson et al.:[3]

Where:

.
D1, D2, D3 are the major axes.

Note:

  • The volume of an ellipsoid is:
.

See also

References

  1. 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.
  2. 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/.
  3. 3.0 3.1 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.
  4. 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.