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Comparison between the location and the histomorphological/immunohistochemical characteristics of noninvasive neoplasms of the ampulla of Vater.

Abstract：

:To determine useful factors when selecting an appropriate procedure for noninvasive ampullary neoplasia, we investigated the relationship between the location and the histomorphological/immunohistochemical characteristics of 56 noninvasive ampullary neoplasms obtained by endoscopic papillectomy (EP). All subjects were classified according to histomorphology and location of neoplasms, and we evaluated the characteristics of each classified group using complementary immunohistochemical procedures. The CK20-positive rates of each location type were also evaluated. Subjects presented with 52 intestinal-type adenomas (low/high grade, 32:20) and 4 noninvasive pancreatobiliary papillary neoplasms (low/high grade, 1:3). Twenty-seven periampullary (peri-AMP)-type tumors and 23 extended-type tumors comprised the intestinal type, and the intra-ampullary (intra-AMP) type was composed of 4 pancreatobiliary and 2 intestinal histomorphological types. The CK20-positive rates of these 3 location types differed significantly (peri-AMP type, 50.6% ± 21.0%; extended type, 35.4% ± 18.6%; intra-AMP type, 6.9% ± 6.3%). The CK20-positive rate for intestinal-type tumors of the intra-AMP location type was lower than that of the peri-AMP location type. Intestinal-type tumors without CDX2 expression included extended and intra-AMP types, which are tumors that may show positive vertical margins when EP is performed. In this study, we found that an understanding of pancreatobiliary-type histology is an important aspect for the investigation of tumors involving the common channel of the ampulla. Furthermore, immunostaining of CDX2 and CK20 provides beneficial information if considering whether to perform an EP.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Yamamoto Y,Nemoto T,Okubo Y,Nihonyanagi Y,Ishiwatari T,Takuma K,Tochigi N,Okano N,Wakayama M,Igarashi Y,Shibuya K

doi

10.1016/j.humpath.2014.05.013

subject

Has Abstract

pub_date

2014-09-01 00:00:00

pages

1910-7

issue

9

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(14)00233-0

journal_volume

45

pub_type

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