Table 5.
MDACC1 N = 408 |
Ohio State2 N = 140 |
Netherlands3 N = 179 |
|
---|---|---|---|
| |||
% IHC Loss | 28.9 | 21.4 | 23.5 |
% MLH1 Loss | 22.0 | 17.1 | 17.9 |
% MLH1 methylated | 82.7 | Not performed | 96.9 |
% Probable Lynch Syndrome | 10.5 | 6.7–10.14 | 6 (3–11) |
MDACC, MD Anderson Cancer Center (4 of the initial 412 patients studied excluded because immunohistochemistry and/or MLH1 methylation did not work)
Backes et al. investigation of 140 endometrial carcinomas with immunohistochemistry for expression of DNR mismatch repair proteins (32).
Leenen et al. investigation of 179 endometrial carcinomas with immunohistochemistry and MLH1 methylation analysis in all patients diagnosed at less than age 50 (33).
Ohio State calculation of % probable Lynch Syndrome is based on an approximate 82.7–96.9% range of MLH1 methylation rate of tumors with immunohistochemical loss of MLH1 found in the MDACC and Netherlands studies.