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Aim. To assess the efficacy and safety of lenvatinib and pembrolizumab for the treatment of mismatch repair-proficient endometrial cancer (EC) in routine clinical practice in Russia.Materials and methods. This multicenter, retrospective, cohort study included patients with recurrent and metastatic EC from 37 cancer centers in Russia treated between May 2020 and April 2023. Patients with histologically verified EC without microsatellite instability who received ≥1 course of pembrolizumab/lenvatinib therapy were included in the study. The primary endpoint was progression-free survival; the clinical characteristics of the patients were additionally analyzed, the objective response rate and the toxicity profile of therapy were assessed.Results. The study included 100 patients. Median age was 65 (30–83) years. The most common histologic tumor subtype was endometrioid adenocarcinoma (68 %); serous adenocarcinoma was diagnosed in 22 % of cases, other types of tumor – 10 % of cases. All patients had pMMR/microsatellite-stable tumors. The median progression-free survival was 7.75 months (95 % confidence interval 0.7–33.8), and a partial response to therapy was observed in 24 % of patients. Almost half of the patients (44 %) required dose reduction due to adverse events. The most common adverse events included fatigue (n = 26; 26 %), hypertension (n = 20; 20 %), and hypothyroidism (n = 14; 14 %).Conclusion. This study confirms the clinical efficacy of lenvatinib and pembrolizumab in patients with recurrent and metastatic EC without mismatch repair system deficiency (pMMR-tumors) in routine clinical practice.

In recent years, significant advances have been made in systemic therapy for patients with metastatic melanoma of the skin, resulting in an increase in one-year overall survival (OS) from 25 to 85% and 5-year OS from less than 10 to 60% in certain patient subgroups. Approximately 50% of patients with metastatic skin melanoma are diagnosed with metastatic brain lesions in the course of the disease. Modern drug therapy for metastatic brain lesions is slowly but surely proving to be effective. Thus, in the presence of a mutation in the BRAF gene, BRAF inhibitor monotherapy provides an intracranial objective response rate (iORR) of 25 to 40%, whereas BRAFi + MEKi combined targeted therapy (CTT) achieves already 58% iORR, including in patients with symptomatic metastases to the brain. However, the duration of responses achieved on targeted therapy (TT) is shorter than for extracranial disease prevalence. On the other hand, regardless of the presence of a BRAF mutation, immunotherapy (PD-1 monotherapy) achieves a response in approximately 20-22% of patients, but these responses are more durable, although fewer than on TT. The combination of CTLA-4 + PD-1 checkpoint inhibitors produces long-lasting responses with a iORR of 51-54%. However, the achievement of these results and an overall increase in life expectancy with immunotherapy is mostly possible in symptom-free patients and in patients receiving low or no doses of glucocorticosteroids (10 mg or less on prednisolone). Therefore, for symptomatic patients, especially those whose tumors have been identified with a BRAF mutation, a combination of targeted therapy, which would quickly achieve an objective response in 58%, and anti-PD1/PDL1 immunotherapy, which is likely to increase the duration of the response achieved and give a chance for a sustained remission, looks promising. This article provides an overview of key studies and our own experience with the triple combination in metastatic brain lesions.