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Ki-67 labeling index in the differential diagnosis of exaggerated placental site, placental site trophoblastic tumor, and choriocarcinoma: a double immunohistochemical staining technique using Ki-67 and Mel-CAM antibodies.

Abstract：

:The diagnosis of placental site trophoblastic lesions, particularly the distinction of a placental site trophoblastic tumor from an exaggerated placental site, can be difficult. Mel-CAM (also known as CD146 and MUC18) is a recently recognized cell adhesion molecule belonging to the immunoglobin gene superfamily that specifically identifies intermediate trophoblast (IT). In this study, we evaluated immunohistochemical staining of Ki-67 (using Mib-1 antibody) in Mel-CAM defined IT as an aid in the differential diagnosis of these lesions. Formalin-fixed tissue samples from 24 normal implantation sites, 19 exaggerated placental sites, five molar implantation sites, 16 placental site trophoblastic tumors, and 12 choriocarcinomas were stained with a Mel-CAM-specific polyclonal antibody and a Ki-67 antibody using streptavidin-biotin immunoperoxidase with two different chromagens. No Ki-67 nuclear labeling was seen in IT of normal implantation sites. The Ki-67 index (mean +/- standard deviation) in IT of exaggerated placental site was near zero, but in the molar implantation sites the Ki-67 index was 5.2% +/- 4.0%. In contrast, the Ki-67 index in IT of placental site trophoblastic tumor was 14% +/- 6.9% and in choriocarcinoma was 69% +/- 20%. The differences in the Ki-67 labeling index were statistically significant (P < .001) between exaggerated placental site, placental site trophoblastic tumor, and choriocarcinoma. In conclusion, a double-staining technique using MIB-1 antibody to determine the Ki-67 proliferative index in Mel-CAM defined IT is a useful technique in the differential diagnosis of exaggerated placental site versus placental site trophoblastic tumor and placental site trophoblastic tumor versus choriocarcinoma.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Shih IM,Kurman RJ

doi

10.1016/s0046-8177(98)90386-0

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

27-33

issue

1

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(98)90386-0

journal_volume

29

pub_type

杂志文章

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