The median PFS was 7 months (range: 3- 18; Trabectedin alone for LMS= 4.3 mos; Dacarbazine alone = 1.6 mos); 6-month PFS rate, 55%; median OS 18.2 months (range: 4- 32); 6-month OS rate, 91%....patients with PR were ER+/PR+ and had uterine LMS….These results suggest that (1) By indirect comparison, the combination regimen using Talimogene laherparepvec, Nivolumab & Trabectedin may be more effective as second/third-line/fourth therapy for advanced leiomyosarcoma with manageable toxicity...The best responders are patients with HR+ uterine LMS.