Aberrant cytokeratin expression as a possible prognostic predictor in poorly differentiated colorectal carcinoma
Background and Aim The cytokeratin (CK)7−/CK20+ immunoprofile is characteristic of colorectal carcinoma (CRC), although CK7+ or CK20− phenotypes are occasionally encountered, particularly in histologically variant CRCs. We analyzed CK7/CK20 profiles in variant CRCs in association with clinicopatholo...
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Published in | Journal of gastroenterology and hepatology Vol. 28; no. 12; pp. 1815 - 1822 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Australia
Blackwell Publishing Ltd
01.12.2013
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Subjects | |
Online Access | Get full text |
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Summary: | Background and Aim
The cytokeratin (CK)7−/CK20+ immunoprofile is characteristic of colorectal carcinoma (CRC), although CK7+ or CK20− phenotypes are occasionally encountered, particularly in histologically variant CRCs. We analyzed CK7/CK20 profiles in variant CRCs in association with clinicopathologic parameters and prognosis.
Methods
CK expression in well‐ and moderately differentiated adenocarcinoma (WMDA) (n = 63), poorly differentiated adenocarcinoma (PDA) (n = 91), mucinous adenocarcinoma (MUA) (n = 81), signet‐ring cell carcinoma (SRCC) (n = 15), undifferentiated carcinoma (UDC) (n = 12), and adenosquamous carcinoma (n = 2) was analyzed using immunohistochemistry. Cut‐off scores were set at 1% for CK7 and 25% for CK20 using the receiver operating characteristic curve analysis of PDA. Association between CK20− and better prognosis in PDA was validated in the second cohort (n = 66).
Results
CK7/CK20 immunoprofiling revealed a predominant CK7−/CK20+ profile in WMDA, MUA, and SRCC, while the majority of UDC was characterized by a CK7−/CK20− profile. The CK7/CK20 profile in PDA was variable. Contingency table analysis revealed that CK expression was not significantly associated with any clinicopathologic parameters in WMDA, PDA, and MUA. However, survival analysis demonstrated that CK20− was significantly associated with better prognosis in PDA. Although CK20− was significantly associated with mismatch repair deficiency in PDA, it was an independent prognostic factor in multivariate analysis. Finally, we confirmed that CK20 status, determined using a 25% cut‐off score, was a significant prognostic parameter in the second PDA cohort.
Conclusions
CK20 status may be used as a prognostic predictor of PDA. |
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Bibliography: | Haraguchi Memorial Trust Fund ArticleID:JGH12319 ark:/67375/WNG-8Z37KF99-7 istex:EE073682318042EA9A4A90806ACF5F20063D0B46 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0815-9319 1440-1746 |
DOI: | 10.1111/jgh.12319 |