Abstract：
:Colorectal cancer (CRC) has traditionally been classified into two groups: microsatellite stable/low-level instability (MSS/MSI-L) and high-level MSI (MSI-H) groups on the basis of multiple molecular and clinicopathologic criteria. Using methylated in tumor (MINT) markers 1, 2, 12, and 31, we stratified 77 primary CRCs into three groups: MINT++ (>2), MINT+ (1-2), and MINT- (0 markers methylated). The MSS/MSI-L/MINT++ group was indistinguishable from the MSI-H/MINT++ group with respect to methylation of p16(INK4a), p14(ARF), and RIZ1, and multiple morphological features. The only significant difference between MSI-H and non-MSI-H MINT++ cancers was the higher frequency of K-ras mutation (P < 0.004) and lower frequency of hMLH1 methylation (P < 0.001) in the latter. These data demonstrate that the separation of CRC into two nonoverlapping groups (MSI-H versus MSS/MSI-L) is a misleading oversimplification.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Whitehall VL,Wynter CV,Walsh MD,Simms LA,Purdie D,Pandeya N,Young J,Meltzer SJ,Leggett BA,Jass JRsubject
Has Abstractpub_date
2002-11-01 00:00:00pages
6011-4issue
21eissn
0008-5472issn
1538-7445journal_volume
62pub_type
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