Test Summary

Genetic defects in these four mismatch repair proteins underlie most cases of Lynch syndrome or hereditary non-polyposis colorectal carcinoma (HNPCC). This IHC panel looks for loss of expression of one or more of these proteins in cases of suspected HNPCC in tumor tissues from colorectal carcinomas, endometrial carcinomas, sebaceous adenoma/carcinoma or other adnexal tumors. If IHC results are abnormal, guidance is provided in the report on the recommended next step in the workup.

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