However, the proportion of cases positive for PD-L1 expression was higher among MPeM compared to MPM (P = .007 for 22C3 assay; P = .04 for 28-8 assay).
Immunohistochemical evaluation of two antibodies against PD-L1 and prognostic significance of PD-L1 expression in epithelioid peritoneal malignant mesothelioma: A RENAPE study.
The frequency of PD-L1 expression was similar in patients with pleural and peritoneal mesothelioma, with 62% and 64% of samples testing positive, respectively.