The hypermutated type with MSI/mismatch repair deficiency (MMRd) group, linked to an intermediate prognosis, exhibited mutations in TP53, FBXW7, CTNNB1, ARID1A, PIK13CA, PIK3RI, PTEN, RPL22, PTEN, KRAS, ATR, CHK1, CDC5, Caspase 5, the BAX gene, and JAK1, which are prevalent in endometrioid EC [54,55,56]. Here, PTEN is linked to mismatch repair cancer syndrome 1.