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. 2009 Dec 16;8:124. doi: 10.1186/1476-4598-8-124

Table 1.

Methylation in the CpG island encompassing the PTPRR isoform 1 start site in colorectal tumors.

Tumor type1 No. Methylated (%)2 Unmethylated (%)
Premalignant lesions
 Polypoid 28 23 (82) 5 (18)
 Nonpolypoid 18 15 (83) 3 (17)
Primary adenocarcinomas 44 42 (95) 2 (5)
Liver metastases3 8 8 (100) 0 (0)

1 The normal mucosa counterpart was also analyzed for 21 samples (see Results)

2 Positivity threshold: ≥ 5% alleles (see Methods)

3 Associated with 8 of the 44 primary cancers listed above