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Stromal thrombospondin-1 expression is a prognostic indicator and a new marker of invasiveness in intraductal papillary-mucinous neoplasm of the pancreas.

Authors: Okada, K  Hirabayashi, K  Imaizumi, T  Matsuyama, M  Yazawa, N  Dowaki, S  Tobita, K  Ohtani, Y  Tanaka, M  Inokuchi, S  Makuuchi, H 
Citation: Okada K, etal., Biomed Res. 2010;31(1):13-9.
Pubmed: (View Article at PubMed) PMID:20203415

The invasion of intraductal papillary-mucinous neoplasm (IPMN) is sometimes difficult to diagnose using only ordinary hematoxylin-eosin sections. The aim of this study was to evaluate the invasion of IPMN more precisely using thrombospondin-1 (TSP1) immunohistochemistry as a useful adjunct to morphological examination. Eighty patients that underwent primary resection for pancreatic IPMNs were retrospectively analyzed. The 80 IPMNs were studied for the expression of TSP1, MUC1-CORE, MUC2, and MUC5AC. The cases were evaluated for dysplasia, the presence of invasion, hisological subtypes, and survival. The 80 IPMNs were classified into 29 intraductal papillary-mucinous adenomas (IPMAs), 10 borderline IPMNs, 18 noninvasive intraductal papillary-mucinous carcinomas (IPMCs), and 23 invasive IPMCs according to the WHO classification. Invasive IPMCs were further divided into 12 minimally invasive IPMCs (MI-IPMCs) and 11 invasive carcinomas originating from IPMCs (IC-IPMCs) according to the Japan Pancreatic Society classification. The rate of strongly positive cases with more than 30% of the cancer stroma area expressing TSP1 was significantly higher in MI-IPMC and IC-IPMC than in noninvasive IPMC (P = 0.035, 0.005). Furthermore, patients in the strongly positive group had a significantly poorer prognosis compared to patients in the negative-weakly positive group (P = 0.008, log-rank test). Of the 80 tumors, 22 were classified into gastric-, 45 into intestinal-, 7 into pancreatobiliary-, and 6 into oncocytic-type IPMNs according to criteria described previously. The cases with a strongly positive expression of TSP1 were frequently detected in the pancreatobiliary and oncocytic types (P = 0.001). In conclusion, stromal TSP1 expression is a prognostic indicator and a new marker of invasiveness in IPMN.

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CRRD Object Information
CRRD ID: 2325021
Created: 2010-05-19
Species: All species
Last Modified: 2010-05-19
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.