**Study on Mexican Patients with Endometrial Cancer** Endometrial Cancer (EC) is a common cancer affecting women's wombs. This study focuses on the molecular classification of EC in Mexican women to understand how it affects their health outcomes. **Molecular classification** involves looking at the cancer's genetic makeup using advanced techniques like **next-generation sequencing (NGS)** to find changes in genes like **TP53** and **POLE**. Another test used is **immunohistochemistry (IHC)** to check for **microsatellite instability**, which helps predict how cancer will behave and respond to treatment. **Key Points:** - The study examines samples from women over 18 with endometrioid-type EC treated between 2015-2019. - Participants must have had surgery at the Instituto Nacional de Cancerología - Mexico (INCan). - This research aims to improve personalized treatment plans but involves no direct treatment or compensation for participants. This study helps doctors tailor treatments to individual patients, potentially improving their recovery chances. However, it doesn't involve direct patient care or benefits during the research itself.