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ASCO 2025 | PFS by clinical factors in the SIENDO trial of selinexor in endometrial cancer

Jalid Sehouli, MD, Charité Universitätsmedizin Berlin, Berlin, Germany, comments on a post-hoc analysis of the ENGOT-EN5/GOG-3055/SIENDO study (NCT03555422), evaluating selinexor as maintenance therapy in patients with advanced or recurrent TP53 wild-type endometrial cancer. Long-term progression-free survival data suggest a consistent benefit across multiple clinical subgroups, including prior treatment response, disease status, and histology. Adverse events were generally manageable. This interview took place during the 2025 American Society of Clinical Oncology (ASCO) Meeting in Chicago, IL.

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Transcript

What we did is we looked at the results of the phase 3 trial using selinexor as a maintenance treatment in cases of advanced and relapsed endometrial cancer after treatment with chemotherapy with paclitaxel and carboplatin. And in a randomized, placebo-controlled trial, we have seen huge differences in patients with P53 wild-type, which is a huge cohort in women with endometrial cancer with a significant and clinically relevant impact on progression-free survival and overall survival...

What we did is we looked at the results of the phase 3 trial using selinexor as a maintenance treatment in cases of advanced and relapsed endometrial cancer after treatment with chemotherapy with paclitaxel and carboplatin. And in a randomized, placebo-controlled trial, we have seen huge differences in patients with P53 wild-type, which is a huge cohort in women with endometrial cancer with a significant and clinically relevant impact on progression-free survival and overall survival. And then we did now the subgroup analyses to look if we have tumors with P53 wild-type but in relationship to the microsatellite instability status to look if this effect is consistent. And even in both groups, in the proficient group and in the deficient group, we can see the significant impact of giving selinexor as a maintenance treatment. So this is across even the subtypes of subtypes. And we are, I think, learning that endometrial cancer patients have maybe much more different subtypes based on our molecular signature. But in case of this drug, what we can see, it is independent from the microsatellite instability status. What is even the question, if it’s maybe better to treat with a checkpoint inhibitor, but we can say it’s independent.

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