Case Report: A Case of Neuroendocrine Carcinoma of the Endometrium with Deficient DNA Mismatch Repair Had Achieved Clinical Complete Response after Combination Therapy

Background: Immunotherapy has markedly reshaped the therapeutic landscape for patients with postoperative progression and metastasis. As a programmed death-1 (PD-1) inhibitor, camrelizumab has been proven to exhibit both efficacy and safety in the treatment of advanced dMMR solid tumors. Case Description: A 58-year-old female patient with neuroendocrine carcinoma of the endometrium (NECE) who was treated with camrelizumab coupled with chemotherapy, subsequent maintenance monotherapy with camrelizumab, and adjuvant pelvic local radiotherapy. Up to December 2024, the patient has survived 28 months since treatment, with 26 months free from disease progression, and the assessment indicated a status of clinical complete response (cCR). Conclusion: The combined regimen achieves notable efficacy and is free of unexpected adverse effects, with only a radiotherapy-related pelvic insufficiency fracture (PIF) report.