Immune checkpoint blockers in patients with unresectable or metastatic thymic epithelial tumours: A meta-analysis

Jordi Remon*, Guillermo Villacampa, Francesco Facchinetti, Massimo Di Maio, Florit Marcuse, Marcello Tiseo, Monique Hochstenbag, Lizza E L Hendriks, Benjamin Besse

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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BACKGROUND: For patients with advanced thymic epithelial tumours (TET), there is no standard second-line treatment after platinum-based chemotherapy. Although immune checkpoint blockers (ICB) are a potential treatment strategy, their efficacy seems limited with an increased risk of immune-related adverse events (ir-AEs), thus hampering their application in daily clinical practice.

METHODS: We performed a meta-analysis to better evaluate the existing evidence about the activity and safety of ICB in the setting of unresectable or metastatic advanced TET previously treated with platinum-based chemotherapy.

RESULTS: Six phase I/II trials met the eligibility criteria including a total of 166 evaluable patients (77% thymic carcinoma, 23% thymoma) evaluable for activity after being treated with pembrolizumab, nivolumab, avelumab or atezolizumab. The overall response rate to ICB was 18.4% (95% CI: 12.3-26.5), and the one-year progression-free survival rate and one-year overall survival rate were 26.0% (95% CI: 19.6-34.6) and 66.9% (95% CI: 59.6-75.2%), respectively. The incidence of grade 3-5 ir-AEs was 26.4%, with 17.1% in thymic carcinoma and 58.3% in thymoma.

CONCLUSIONS: Despite the absence of a robust demonstration of efficacy in the context of randomised trials, our results suggest ICB as a potential strategy in patients with pretreated TET, mainly among patients with thymic carcinoma. Close monitoring is strongly advised to detect severe immune-toxicity.

Original languageEnglish
Pages (from-to)117-124
Number of pages8
JournalEuropean Journal of Cancer
Issue number1
Early online date12 Dec 2022
Publication statusPublished - Feb 2023


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