期刊
BRITISH JOURNAL OF CANCER
卷 124, 期 3, 页码 564-566出版社
SPRINGERNATURE
DOI: 10.1038/s41416-020-01130-x
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资金
- National Institute of Health Kirschtein National Research Service (T32) Award
- University of Chicago, Department of Surgical Oncology
PD-L1 expression in patients with malignant peritoneal mesothelioma is associated with germline and somatic mutations. Patients who had received prior chemotherapy showed varying levels of PD-L1 expression, with some exhibiting upregulation and others downregulation. The heterogeneity in PD-L1 expression before and after cytotoxic therapies may impact the effectiveness of immune checkpoint inhibition in this challenging disease.
Programmed death-ligand 1 (PD-L1) expression has been described in patients with malignant peritoneal mesothelioma (MPM), but treatment strategies utilising immune checkpoint inhibition are yet to be defined. Here, we examine levels of PD-L1 expression in MPM patients treated with systemic and/or intraperitoneal chemotherapy using tissue from patient tumour biopsies or resections at multiple time points. We found the mean PD-L1 expression was higher in those with a germline mutation and/or those with a higher somatic mutation burden. Moreover, PD-L1 expression was lower in patients who had received prior chemotherapy as compared to the treatment-naive cohort. Twenty patients who received chemotherapy, either systemic and/or peritoneal, between PD-L1 measurements showed marked heterogeneity. Six (30%) patients demonstrated upregulation of PD-L1, while eight (40%) demonstrated downregulation. Heterogeneity in PD-L1 expression in MPM before and after cytotoxic therapies may present an additional consideration when initiating immune checkpoint inhibition in this rare and challenging disease.
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