Moreover, it has been suggested that all MMR deficient endometrial carcinomas may have a similar prognosis regardless of the histotype [8]; the only exception in this regard is represented by undifferentiated/dedifferentiated carcinoma, in which the immunohistochemical expression of SWI/SNF complex proteins seems to be more prognostically relevant than the MMR status [19]. Here, MRC1 is linked to endometrial carcinoma.