Differences in loss of p16INK4 protein expression by promoter methylation between left- and right-sided primary colorectal carcinomas.

Abstract:

:The p16INK4 gene, encoding a cyclin-dependent kinase inhibitor, is frequently methylated in colorectal cancer, and a side-specific methylation frequency was suggested. To clarify the frequency of real loss of tumor suppressor function dependent on anatomical localization, we investigated 43 primary colorectal carcinomas by determining aberrant promoter methylation using methylation-specific PCR. In addition, we evaluated the p16INK4 protein expression immunohistochemically. P16INK4 methylation was found in 18 of 43 (41.9%) cases. Fourteen of 43 cases (32.6%) were negative for p16INK4 protein, whereas 10 of these 14 cases showed methylation of the promoter region of the p16INK4 gene. Methylation of the promoter region was significantly correlated with loss of p16INK4 protein (p<0.01). P16INK4 tumor suppressor inactivation was significantly correlated with proximal location (p=0.031 for methylation and p=0.028 for immunostaining). The groups characterized by tumors with and without aberrant promoter methylation or loss of p16INK4 immunostaining showed no significant difference in either Dukes' stage and grade or age and gender. This is further evidence that p16INK4 methylation causes gene silencing. Loss of p16INK4 tumor suppressor function in colorectal tumors was associated with proximal location in the gut.

journal_name

Int J Oncol

authors

Schneider-Stock R,Boltze C,Peters B,Höpfner T,Meyer F,Lippert H,Roessner A

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

1009-13

issue

4

eissn

1019-6439

issn

1791-2423

journal_volume

23

pub_type

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