1118P Time to quality of life (QoL) deterioration in patients (pts) with mismatch repair proficient/microsatellite stable (MMRp/MSS) primary advanced or recurrent endometrial cancer (pA/rEC) and by population subgroups in the ENGOT-EN6-NSGO/GOG-3031/RUBY trial - Boere, I.A.; Edelson, M.; Hietanen, S.H.; Gilbert, L.; Gold, M.A.; Sukhina, O.; Slomovitz, B.M.; Zavallone, L.; Coleman, R.L.; Lundgren, C.; Boone, J.; Buttin, B.; et al. (Annals of Oncology, 2025)