Immunohistochemical expression of CDX2, β-catenin, and TP53 in inflammatory bowel disease-associated colorectal cancer

✍ Scribed by Camille Laurent; Magali Svrcek; Jean-François Flejou; Marie-Pierre Chenard; Bernard Duclos; Jean-Noël Freund; Jean-Marie Reimund

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 568 KB
• Volume: 17
• Category: Article
• ISSN: 1078-0998
• DOI: 10.1002/ibd.21451

✦ Synopsis

Background: Inflammatory bowel disease (IBD) exposes patients to an increased risk of colorectal cancer (i-CRC) and differences between i-CRC and sporadic colorectal cancer (s-CRC) pathogenesis were reported. In s-CRC, studies indicate abnormalities in the tumor-suppressor gene Cdx2. This study compared CDX2, b-catenin, and TP53 expression in i-CRC, s-CRC, noncancer IBD, and normal control colonic mucosa.

Methods: Expression was investigated by immunohistochemistry in 10 normal, 20 s-CRC, 11 noncancer colonic IBD and 30 i-CRC samples, and in four samples of Crohn's disease (CD)-associated small bowel adenocarcinoma (i-SBA).

Results:

In normal and noncancer IBD samples, CDX2 was confined to the colonocytes nuclei. CDX2 expression was normal in 90% of i-CRC, regardless of tumor differentiation or inflammation intensity. By contrast, CDX2 expression was altered in 45% s-CRC, particularly at the front of invasion in undifferentiated tumors. b-Catenin was restricted to cell membrane in all controls, in 91% noncancer IBD, and in 84% i-CRC samples, whereas 35% s-CRC showed cytoplasmic redistribution and exclusive nuclear staining at the front of invasion. TP53 was strongly and homogeneously expressed in i-CRC nuclei compared to normal control or s-CRC, and increases with inflammation intensity. Nested or diffuse TP53 was found in 81.8% of noncancer IBD samples with a higher proportion of TP53-expressing cells in the most inflamed samples. CDX2, b-catenin, and TP53 expression in CD-associated SBA appears similar to that of i-CRC. Neither Cdx2 nor b-catenin alterations are prominent features of i-CRC.

Conclusions:

In i-CRC and CD-associated SBA, carcinogenesis is associated early with p53 mutations and to inflammation intensity.