Endometrial cancer (EC) affects the lining of the uterus and is common in Mexico. This study aims to understand EC better by looking at its molecular classification, which can help doctors predict how the cancer will behave and decide on the best treatment. Researchers will use a technique called next-generation sequencing (NGS) to study genetic changes in the cancer cells. They will also check for signs of microsatellite instability, which is when certain areas of DNA are more prone to mutations. This study focuses on a specific type of EC called endometrioid, and tests will be done on tissue samples from patients treated between 2015 and 2019.

• Participation requires having had surgery for endometrioid-type EC at INCan.
• The study does not accept samples from patients with other types of cancer or those with recent cancer history.
• No new treatments or medications are involved; the study aims to understand cancer genetics.