Summary of methylation and imprinting status of 37 patients whose
tumors were microsatellite stable [MSI(−)] but had no germline
mutation of MLH1 or MSH2, 20 patients
whose tumors were microsatellite unstable [MSI(+)] but had no
germline mutation of MLH1 or
MSH2[Mut(−)], and five patients with MSI(+) tumors
and a germline mutation of MLH1[Mut(+)]. Shown is the
methylation status of the promoters of MLH1 and
p16 in the tumors (black, methylated; white,
unmethylated) and imprinting status (black, loss of imprinting; white,
retention of imprinting) in tumors and corresponding normal colonic
mucosa (NM). Case identifiers are in the left column.
MLH1-1, promoter region described by Herman et
al. (2). MLH1-2, promoter region
described by Deng et al. (22).