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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Surg+Pathol
2012 ; 36
(12
): 1747-60
Nephropedia Template TP
gab.com Text
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English Wikipedia
Diagnostic reproducibility of hydatidiform moles: ancillary techniques (p57
immunohistochemistry and molecular genotyping) improve morphologic diagnosis for
both recently trained and experienced gynecologic pathologists
#MMPMID22992698
Gupta M
; Vang R
; Yemelyanova AV
; Kurman RJ
; Li FR
; Maambo EC
; Murphy KM
; DeScipio C
; Thompson CB
; Ronnett BM
Am J Surg Pathol
2012[Dec]; 36
(12
): 1747-60
PMID22992698
show ga
Distinction of hydatidiform moles from nonmolar specimens (NMs) and
subclassification of hydatidiform moles as complete hydatidiform mole (CHM) and
partial hydatidiform mole (PHM) are important for clinical practice and
investigational studies; however, diagnosis based solely on morphology is
affected by interobserver variability. Molecular genotyping can distinguish these
entities by discerning androgenetic diploidy, diandric triploidy, and biparental
diploidy to diagnose CHMs, PHMs, and NMs, respectively. Eighty genotyped cases
(27 CHMs, 27 PHMs, 26 NMs) were selected from a series of 200 potentially molar
specimens previously diagnosed using p57 immunohistochemistry and genotyping.
Cases were classified by 6 pathologists (3 faculty level gynecologic pathologists
and 3 fellows) on the basis of morphology, masked to p57 immunostaining and
genotyping results, into 1 of 3 categories (CHM, PHM, or NM) during 2 diagnostic
rounds; a third round incorporating p57 immunostaining results was also
conducted. Consensus diagnoses (those rendered by 2 of 3 pathologists in each
group) were also determined. Performance of experienced gynecologic pathologists
versus fellow pathologists was compared, using genotyping results as the gold
standard. Correct classification of CHMs ranged from 59% to 100%; there were no
statistically significant differences in performance of faculty versus fellows in
any round (P-values of 0.13, 0.67, and 0.54 for rounds 1 to 3, respectively).
Correct classification of PHMs ranged from 26% to 93%, with statistically
significantly better performance of faculty versus fellows in each round
(P-values of 0.04, <0.01, and <0.01 for rounds 1 to 3, respectively). Correct
classification of NMs ranged from 31% to 92%, with statistically significantly
better performance of faculty only in round 2 (P-values of 1.0, <0.01, and 0.61
for rounds 1 to 3, respectively). Correct classification of all cases combined
ranged from 51% to 75% by morphology and 70% to 80% with p57, with statistically
significantly better performance of faculty only in round 2 (P-values of 0.69,
<0.01, and 0.15 for rounds 1 to 3, respectively). p57 immunostaining
significantly improved recognition of CHMs (P<0.01) and had high reproducibility
(?=0.93 to 0.96) but had no impact on distinction of PHMs and NMs. Genotyping
provides a definitive diagnosis for the ?25% to 50% of cases that are
misclassified by morphology, especially those that are also unresolved by p57
immunostaining.