Nevertheless, the available results about MMR (conventionally detected by IHC) or MSI {usually detected by polymerase chain reaction (PCR)} status in TNBC are still limited and contradictory to the data compared to colorectal and endometrial carcinoma (started with Lynch syndrome research) for which there were relevant guidelines for MMR and MSI detection. The gene discussed is MRC1; the disease is endometrial carcinoma.