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Clinical characteristics and biomarkers of severe immune checkpoint inhibitor-related pneumonitis triggered by immunotherapy followed by radiation: a case report

医学 肺炎 放射治疗 免疫疗法 不利影响 免疫系统 内科学 CD8型 肿瘤科 癌症 免疫学
作者
Yan Zhu,Jianhe Yu,Qun Ren,Xiaohong Wu,Hongxia Xu,Tian Tian,Jiang Liu
出处
期刊:Frontiers in Immunology [Frontiers Media]
卷期号:15 被引量:1
标识
DOI:10.3389/fimmu.2024.1454114
摘要

Background The advent of immune checkpoint inhibitors (ICIs) has revolutionized the treatment landscape for tumor patients, dramatically improving survival rate. However, patients treated with immunotherapy are inevitably at risk of immune-related adverse events (irAEs). Immune checkpoint inhibitor-related pneumonitis (ICI-P) is an important type of IrAEs with a potentially lethal risk, which should be given more attention. Diagnosis and timely treatment of ICI-P is challenging due to the lack of specificity of its clinical and radiological features. Besides, poor understanding of biological mechanisms of ICI-P has led to a lack of reliable biomarkers to identify patients at risk, limiting timely treatment and proper management of it. Case presentation We presented longitudinal clinical features and successful treatment experience in a metastatic esophageal squamous cell carcinoma (ESCC) patient treated with immunochemotherapy followed by palliative radiotherapy for cervical lymph nodes who developed severe pneumonitis outside of the radiation field ten days after completion of radiotherapy suggestive of ICI-P. In addition, analysis of circulating biomarkers demonstrated an increase in platelet-to-lymphocyte ratio (PLR) and platelet-to-monocyte ratio (PMR), as well as the levels of CD4 + T and CD8 + T cells that tracked with the progression of ICI-P, and then decreased with corticosteroid treatment. Conclusions Our data highlight the imaging manifestations associated with ICI-related pulmonary toxicity and describe the dynamics of the corresponding circulating markers. Although our results reveal that dynamic monitoring of PLR and PMR as well as the levels of CD4 + T and CD8 + T cells may predict the risk of ICI-P, further investigations are needed to elucidate the underlying molecular and biological mechanisms for better management of ICI-P.
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