[The influence of molecular classification in the selection of postoperative adjuvant therapy in endometrial...

Objective: To study the value of molecular classification in postoperative adjuvant therapy for endometrial carcinoma (EC). Methods: Patients with stage Ⅰ EC who underwent surgical-pathological staging surgery and molecular classification in Peking University Third Hospital from January 2020 to April 2022 were retrospectively analyzed. The influence of different molecular types of EC on postoperative adjuvant therapy were studied. Results: The age of the 196 patients was (55.1±10.2) years old, and the body mess index (BMI) was (26.0±3.9) kg/m². Molecular classification was performed in 196 stage ⅠEC patients, identifying the 4 subgroups: POLE mutation (POLEmut, n=19, 9.7%), mismatch repair-deficient (dMMR, n=28, 14.3%), no-specific molecular profile (NSMP, n=142, 72.4%) and p53 mutation (p53abn, n=7, 3.6%). Molecular classification was one of the influencing factors on the selection of postoperative adjuvant therapy for EC patients (P=0.003). POLEmut, dMMR and NSMP subtypes were not the variables in selecting radiotherapy or combined chemo-radiotherapy postoperatively. p53abn subtype was not the influencer for radiotherapy, however, it may contribute to the selection of combined chemo-radiotherapy postoperatively (P<0.001). Conclusion: The p53abn subtype in the molecular classification is an influencing factor in the selection of combined chemo-radiotherapy for EC patients postoperatively.