Abstract
The publication of two large randomized studies - the ENGOT-EN-6-NSGO/GOG-3031/RUBY trial and the NRG-GY018 trial - which investigated combining chemotherapy with immunotherapy to treat patients with primary advanced or recurrent endometrial cancer (EC) has transformed the clinical study landscape in terms of first-line therapy for affected patients and has set a new standard of therapy. In the ENGOT-EN-6-NSGO/GOG-3031/RUBY trial, the addition of dostarlimab to standard chemotherapy with carboplatin and paclitaxel resulted in a significant and clinically relevant improvement of progression-free survival and overall survival in the overall population, a significant and clinically relevant improvement of progression-free survival and overall survival in the subgroup with dMMR/MSI-high tumors, and a significant and clinically relevant improvement of progression-free survival in the subgroup with pMMR/MSI-low tumors. In the NRG-GY018 trial, the addition of pembrolizumab to standard chemotherapy with carboplatin and paclitaxel resulted in a significant and clinically relevant improvement of progression-free survival in the group with dMMR tumors, and a significant and clinically relevant improvement of progression-free survival in the group with pMMR tumors. As expected, the effect in both trials was much more pronounced in the group of patients with dMMR/MSI-high tumors. According to the assessment of the Uterus Organ Commission of the AGO, all patients with dMMR/MSI-high tumors should receive chemoimmunotherapy and all patients with pMMR/MSI-low tumors who meet the inclusion criteria of the two trials discussed here may have chemoimmunotherapy. For dostarlimab this means: patients with EC recurrence who will not undergo surgery or radiotherapy, patients with stage IIIA, IIIB or IIIC1 disease and a measurable lesion postoperatively, patients with stage IIIA, IIIB or IIIC1 disease with histological findings of serous EC, clear-cell EC or carcinosarcoma with or without a measurable lesion postoperatively, and patients with stage IIIC2 or IV disease with or without a measurable lesion postoperatively. For pembrolizumab this means: patients with EC recurrence (except carcinosarcoma) who will not undergo surgery or radiotherapy, and patients with stage III or IVA disease (except carcinosarcoma) and a measurable lesion postoperatively or with stage IVB disease with or without a measurable lesion.