Difference between revisions of "Prostate-specific antigen"

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Where:
Where:
:<math>volume = \frac{\pi}{6} H \times W \times L</math>.<ref>{{Cite journal  | last1 = Eri | first1 = LM. | last2 = Thomassen | first2 = H. | last3 = Brennhovd | first3 = B. | last4 = Håheim | first4 = LL. | title = Accuracy and repeatability of prostate volume measurements by transrectal ultrasound. | journal = Prostate Cancer Prostatic Dis | volume = 5 | issue = 4 | pages = 273-8 | month =  | year = 2002 | doi = 10.1038/sj.pcan.4500568 | PMID = 12627211 }}
</ref>
:H, W, L are the height, width and length.
An alternate estimation of the volume is:
:<math>volume = \frac{1}{2} D1 \times D2 \times D3</math>.
:<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.

Revision as of 18:53, 18 August 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:

.[5]
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. 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.
  5. 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.