Difference between revisions of "High-grade prostatic intraepithelial neoplasia"

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High-grade prostatic intraepithelial neoplasia (view source)

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#redirect [[Prostate gland#High-grade prostatic intraepithelial neoplasia]]
{{ Infobox diagnosis
| Name      = {{PAGENAME}}
| Image      = High-grade_prostatic_intraepithelial_neoplasia_high_mag.jpg
| Width      =
| Caption    = High-grade prostatic intraepithelial neoplasia. [[H&E stain]].
| Synonyms  = prostatic intraepithelial neoplasia
| Micro      = nuclear changes (hyperchromatic nuclei, nucleoli present, +/-increased NC ratio, mild-to-moderate nuclear enlargement), medium-to-large glands with the architecture of HGPIN (tufted, micropapillary, flat)
| Subtypes  =
| LMDDx      = [[basal cell hyperplasia]], [[prostatic adenocarcinoma]], [[PIN-like prostatic ductal adenocarcinoma]], [[atypical small acinar proliferation]] (biopsy only), [[atypical intraductal proliferation]]
| Stains    =
| IHC        = AMACR +ve, basal cells present (p63 +ve, CK34betaE12 +ve)
| EM        =
| Molecular  =
| IF        =
| Gross      = not evident
| Grossing  =
| Site      = [[prostate gland]]
| Assdx      = [[prostate adenocarcinoma]]
| Syndromes  =
| Clinicalhx =
| Signs      = none
| Symptoms  = none
| Prevalence = common
| Bloodwork  = +/-PSA elevated
| Rads      = not identifiable
| Endoscopy  =
| Prognosis  = benign
| Other      =
| ClinDDx    = [[prostate carcinoma]]
| Tx        = follow-up +/-re-biopsy
}}
'''High-grade prostatic intraepithelial neoplasia''', abbreviated as ''HGPIN'', is considered the precursor for [[prostate carcinoma]].
 
It may be referred to as ''prostatic intraepithelial neoplasia'', abbreviated ''PIN''.
 
==General==
*Thought to be a precursor lesion for prostate adenocarcinoma.
*Incidence ~5-8% on core biopsy.<ref name=pmid16469560/>
*Multifocal HGPIN considered a risk for prostate cancer on re-biopsy.<ref name=pmid21191509>{{Cite journal  | last1 = Srigley | first1 = JR. | last2 = Merrimen | first2 = JL. | last3 = Jones | first3 = G. | last4 = Jamal | first4 = M. | title = Multifocal high-grade prostatic intraepithelial neoplasia is still a significant risk factor for adenocarcinoma. | journal = Can Urol Assoc J | volume = 4 | issue = 6 | pages = 434 | month = Dec | year = 2010 | doi =  | PMID = 21191509 }}</ref><ref name=pmid19524976>{{Cite journal  | last1 = Merrimen | first1 = JL. | last2 = Jones | first2 = G. | last3 = Walker | first3 = D. | last4 = Leung | first4 = CS. | last5 = Kapusta | first5 = LR. | last6 = Srigley | first6 = JR. | title = Multifocal high grade prostatic intraepithelial neoplasia is a significant risk factor for prostatic adenocarcinoma. | journal = J Urol | volume = 182 | issue = 2 | pages = 485-90; discussion 490 | month = Aug | year = 2009 | doi = 10.1016/j.juro.2009.04.016 | PMID = 19524976 }}</ref>
**A small focus of HGPIN does not appear to be associated with an increased risk for prostate cancer on re-biopsy at one year if the initial biopsy had 8 or more cores.<ref name=pmid16406886>{{Cite journal  | last1 = Herawi | first1 = M. | last2 = Kahane | first2 = H. | last3 = Cavallo | first3 = C. | last4 = Epstein | first4 = JI. | title = Risk of prostate cancer on first re-biopsy within 1 year following a diagnosis of high grade prostatic intraepithelial neoplasia is related to the number of cores sampled. | journal = J Urol | volume = 175 | issue = 1 | pages = 121-4 | month = Jan | year = 2006 | doi = 10.1016/S0022-5347(05)00064-9 | PMID = 16406886 }}</ref>
*Interrater variability is moderate (kappa ~ 0.45) for benign versus HGPIN.<ref name=pmid8832557>{{Cite journal  | last1 = Allam | first1 = CK. | last2 = Bostwick | first2 = DG. | last3 = Hayes | first3 = JA. | last4 = Upton | first4 = MP. | last5 = Wade | first5 = GG. | last6 = Domanowski | first6 = GF. | last7 = Klein | first7 = MA. | last8 = Boling | first8 = EA. | last9 = Stilmant | first9 = MM. | title = Interobserver variability in the diagnosis of high-grade prostatic intraepithelial neoplasia and adenocarcinoma. | journal = Mod Pathol | volume = 9 | issue = 7 | pages = 742-51 | month = Jul | year = 1996 | doi =  | PMID = 8832557 }}</ref>
 
Low-grade prostatic intraepithelial neoplasia:
*Should ''not'' be reported.<ref name=pmid16469560>{{Cite journal  | last1 = Epstein | first1 = JI. | last2 = Herawi | first2 = M. | title = Prostate needle biopsies containing prostatic intraepithelial neoplasia or atypical foci suspicious for carcinoma: implications for patient care. | journal = J Urol | volume = 175 | issue = 3 Pt 1 | pages = 820-34 | month = Mar | year = 2006 | doi = 10.1016/S0022-5347(05)00337-X | PMID = 16469560 }}</ref>
*Believed to be irrelevant biologically/clinically.
**''PIN'' not otherwise specified refers to ''HGPIN''.
**Low-grade PIN has the architecture of HGPIN but lacks the nuclear atypia.
 
===HGPIN and cancer on follow-up biopsy===
Prostate cancer on follow-up biopsy by number of HGPIN sites from Merrimen ''et al.'':<ref name=pmid19524976>{{Cite journal  | last1 = Merrimen | first1 = JL. | last2 = Jones | first2 = G. | last3 = Walker | first3 = D. | last4 = Leung | first4 = CS. | last5 = Kapusta | first5 = LR. | last6 = Srigley | first6 = JR. | title = Multifocal high grade prostatic intraepithelial neoplasia is a significant risk factor for prostatic adenocarcinoma. | journal = J Urol | volume = 182 | issue = 2 | pages = 485-90; discussion 490 | month = Aug | year = 2009 | doi = 10.1016/j.juro.2009.04.016 | PMID = 19524976 }}</ref>
{| class="wikitable sortable"
! Number of cores<br> with HGPIN
! Odds ratio of cancer<br> on follow-up (95% CI)
|-
| 0
| 1.00 (reference)
|-
| 1
| 1.02 (0.73-1.40)
|-
| 2
| 1.55 (1.08-2.21)
|-
| 3
| 1.99 (1.16-3.40)
|-
| 4
| 2.66 (1.10-6.40)
|}
 
==Gross==
*Not evident on gross.
 
==Microscopic==
Features:<ref name=Ref_Amin3-56>{{Ref Amin|3-56}}</ref><ref name=pmid2002502>{{Cite journal  | last1 = Chin | first1 = AI. | last2 = Dave | first2 = DS. | last3 = Rajfer | first3 = J. | title = Is repeat biopsy for isolated high-grade prostatic intraepithelial neoplasia necessary? | journal = Rev Urol | volume = 9 | issue = 3 | pages = 124-31 | month =  | year = 2007 | doi =  | PMID = 17934569 | PMC = 2002502 }}</ref>
*Medium to large glands with architectural changes - see ''HGPIN architecture'' below.
**Described as "epithelial hyperplasia".
*Diagnosed on basis of nuclear changes.
**Hyperchromatic nuclei - '''key (low power) feature'''.
**Nucleoli present - '''key (high power) feature'''.
**Often increased NC ratio.
**Nuclear enlargement - usually subtle/appreciated at high magnification only.
*Tinctorial changes of the cytoplasm - usually amphophilic (red) or basophilic (blue).
 
Notes:
*[[Nucleoli]] should be visible with the 20x objective.
**If one uses the 40x objective... one over calls.
*May need IHC for cancer versus HGPIN.
*Nucleoli should be present in >= 10% of cells in a gland to call it HGPIN.<ref>{{Ref Amin|3-55}}</ref>
**This criterium is not required by all pathologists.
 
DDx:
*[[Basal cell hyperplasia of the prostate]].
*[[Intraductal carcinoma of the prostate]].
*[[Prostatic adenocarcinoma]] - glands with HGPIN have two or more distinct cells layers.
**[[PIN-like prostatic ductal adenocarcinoma]] - glands crowded.
*Benign prostate - HGPIN has nuclear changes.
**Central zone typically has small nucleoli;<ref>{{Cite journal  | last1 = Egevad | first1 = L. | title = Cytology of the central zone of the prostate. | journal = Diagn Cytopathol | volume = 28 | issue = 5 | pages = 239-44 | month = May | year = 2003 | doi = 10.1002/dc.10275 | PMID = 12722118 }}</ref> however, the glands are larger.
*[[Atypical intraductal proliferation]] - a [[waffle diagnosis]] when criteria insufficient for [[intraductal carcinoma of the prostate]].
 
===HGPIN architecture===
There are several forms:<ref name=Ref_WMSP380>{{Ref WMSP|380}}</ref><ref name=pmid14739906>{{Cite journal  | last1 = Bostwick | first1 = DG. | last2 = Qian | first2 = J. | title = High-grade prostatic intraepithelial neoplasia. | journal = Mod Pathol | volume = 17 | issue = 3 | pages = 360-79 | month = Mar | year = 2004 | doi = 10.1038/modpathol.3800053 | PMID = 14739906 | url=http://www.nature.com/modpathol/journal/v17/n3/pdf/3800053a.pdf }}</ref>
*Flat - uncommon.
*Tufting - common.
*Micropapillary - common.
 
Notes:
*The architectural pattern is '''not''' thought to have any prognostic significance; however, it may be useful for differentiating it from benign prostate.
*"Cribriform HGPIN" previously existed; it is now classified as [[atypical intraductal proliferation]].<ref name=pmid35758185>{{cite journal |authors=Kench JG, Amin MB, Berney DM, Compérat EM, Cree IA, Gill AJ, Hartmann A, Menon S, Moch H, Netto GJ, Raspollini MR, Rubin MA, Tan PH, Tsuzuki T, Turjalic S, van der Kwast TH, Zhou M, Srigley JR |title=WHO Classification of Tumours fifth edition: evolving issues in the classification, diagnosis, and prognostication of prostate cancer |journal=Histopathology |volume=81 |issue=4 |pages=447–458 |date=October 2022 |pmid=35758185 |pmc=9542779 |doi=10.1111/his.14711 |url=}}</ref>
 
===Images===
<gallery>
Image:High-grade_prostatic_intraepithelial_neoplasia_low_mag.jpg | HGPIN - low mag. (WC/Nephron)
Image:High-grade_prostatic_intraepithelial_neoplasia_intermed_mag.jpg | HGPIN - intermed. mag. (WC/Nephron)
Image:High-grade_prostatic_intraepithelial_neoplasia_high_mag.jpg | HGPIN - high mag. (WC/Nephron)
</gallery>
 
==IHC==
*HGPIN: AMACR +ve, p63 +ve, HMWCK +ve.
*Cancer: AMACR +ve, p63 -ve, HMWCK -ve.
*Normal: AMACR -ve‡, p63 +ve, HMWCK +ve.
 
Note:
*‡ May be positive in normal prostate.<ref name=pmid15602744>{{Cite journal  | last1 = Ananthanarayanan | first1 = V. | last2 = Deaton | first2 = RJ. | last3 = Yang | first3 = XJ. | last4 = Pins | first4 = MR. | last5 = Gann | first5 = PH. | title = Alpha-methylacyl-CoA racemase (AMACR) expression in normal prostatic glands and high-grade prostatic intraepithelial neoplasia (HGPIN): association with diagnosis of prostate cancer. | journal = Prostate | volume = 63 | issue = 4 | pages = 341-6 | month = Jun | year = 2005 | doi = 10.1002/pros.20196 | PMID = 15602744 }}
</ref>
 
==Sign out==
<pre>
A. PROSTATE, RIGHT LATERAL SUPERIOR, BIOPSY:
- HIGH-GRADE PROSTATIC INTRAEPITHELIAL NEOPLASIA;
- NEGATIVE FOR MALIGNANCY.
</pre>
 
===Mostly lower case===
<pre>
A. Left Apex:
-  Focal high grade prostatic intraepithelial neoplasia, chronic
  inflammation
B. Left Middle Zone:
-  Benign prostatic tissue
 
C. Left Base:
-  Benign prostatic tissue
 
D. Right Apex:
-  Benign prostatic tissue
 
E. Right Middle Zone:
-  Benign prostatic tissue
 
F. Right Base:
-  Benign prostatic tissue
</pre>
 
<pre>
Colour seen in tissue cores at sign-out: green
</pre>
 
===Comment for many cores with HGPIN===
If there is (isolated) HGPIN in more than 3 or 4 cores:
<pre>
COMMENT:
As high-grade prostatic intraepithelial neoplasia is found in multiple cores, close
follow-up is suggested, with a re-biopsy when indicated.
</pre>
 
===TURP===
<pre>
PROSTATE TISSUE, TRANSURETHRAL RESECTION OF THE PROSTATE (TURP):
- HIGH-GRADE PROSTATIC INTRAEPITHELIAL NEOPLASIA (HGPIN), FOCAL.
- ACUTE AND CHRONIC INFLAMMATION.
- UROTHELIUM WITH MILD INFLAMMATION.
- NEGATIVE FOR MALIGNANCY.
</pre>
 
==See also==
*[[Prostate gland]].
*[[Prostate cancer]].
 
==References==
{{Reflist|2}}
 
[[Category:Diagnosis]]
[[Category:Prostate gland]]
Michael
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