Very low incidence of microsatellite instability in intraductal papillary-mucinous neoplasm of the pancreas.

Abstract:

:Intraductal papillary-mucinous carcinoma (IPMC) of the pancreas, a new entity of pancreatic cancer with a favorable prognosis, has shown a gradual increase in the number of reported cases. Patients with high-frequency microsatellite instability (MSI-H) tumors have been shown to survive longer than those with low-frequency MSI (MSI-L) or microsatellite stable (MSS) tumors in colorectal and gastric cancer. We investigated whether MSI-H in patients with IPMC can contribute to a good prognosis. The formalin-fixed paraffin-embedded tumors and surrounding normal pancreatic tissues from 10 patients with IPMCs and 16 with intraductal papillary-mucinous adenomas (IPMAs) were provided for DNA extraction after microdissection. Polymerase chain reaction (PCR) was carried out using 8 microsatellite primer marker sets. The mixed PCR samples were analyzed using a genetic analyzer. MSI-H was determined by assessment of microsatellite variations in 3 or more of the 8 tested markers. Immunohistochemical staining of the MSI-responsible proteins hMLH1 and hMSH2 was conducted for both the IPMC and IPMA samples. Ten percent of IPMC harbored MSI-H tumors, whereas no MSI-H tumors were detected in the IPMAs. Thirty percent of IPMC tumors and 25% of IPMA tumors showed MSI-L. All IPMCs and IPMAs showed normal expression of both hMLH1 and hMSH2. MSI-H and loss of hMLH1 and hMSH2 are very rare events in both IPMCs and IPMAs. We conclude that a good prognosis for patients with IPMC is not associated with MSI-H.

journal_name

Int J Cancer

authors

Nakata B,Yashiro M,Nishioka N,Aya M,Yamada S,Takenaka C,Ohira M,Ishikawa T,Nishino H,Wakasa K,Seki S,Hirakawa K

doi

10.1002/ijc.10771

keywords:

subject

Has Abstract

pub_date

2002-12-20 00:00:00

pages

655-9

issue

6

eissn

0020-7136

issn

1097-0215

journal_volume

102

pub_type

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