Promising results have been reported with immune checkpoint inhibitors (ICI) in a small proportion of MPM patients. MMR deficiency (dMMR) has been well described in several malignancies and was approved as a biomarker for anti-PD-1 inhibitors. Next generation sequencing (NGS) data demonstrated that 2% of MPM harbor microsatellite instability. The aim of this study is to characterize MMR by immunohistochemistry (IHC) in a series of MPM including a subset of patients treated with immunotherapy.
Tumors of 159 MPM p diagnosed between 2002 and 2017 were reviewed. Formalin-fixed, paraffin-embedded tissue was stained for MLH1, MSH2, MSH6 and PMS2 and tumors were classified as dMMR (MMR protein expression negative) and MMR intact (all MMR proteins positively expressed). We retrospectively collected clinical outcomes under standard chemotherapy and experimental immunotherapy in the entire cohort.
MMR protein expression was analyzed in 158 samples with enough tissue and was positive in all of the cases. Twenty two patients received ICI with anti-CTLA4 or anti-PD-1 blockade in clinical trials, 58% had a response or stable disease for more than 6 m, with median progression-free survival (PFS) of 5.7 m (2.1–26.1 m). The median overall survival (mOS) in all population was 15 months (m) (13.5–18.8 m). In a multivariable model factors associated to improved mOS were PS 0, neutrophil–lymphocyte ratio (NLR) < 5 and epithelioid histology (p < 0.001).
In our series we were unable to identify any MPM patient with dMMR by IHC. Further studies are needed to elucidate potential predictive biomarkers of ICI benefit in MPM.
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We want to acknowledge the Cellex Foundation for providing facilities and equipment, and Spanish Cancer Association (AECC) for its support.
This work was supported by the Spanish Cancer Association (AECC) Scientific Foundation (GCB14-2170).
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The authors declare that they have no conflict of interest.
Approval for the use of the tissue in research was obtained from the ethical local committee from both hospitals.
All patients gave written inform consent before enrollment.
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Cedrés, S., Ponce-Aix, S., Iranzo, P. et al. Analysis of mismatch repair (MMR) proteins expression in a series of malignant pleural mesothelioma (MPM) patients. Clin Transl Oncol 22, 1390–1398 (2020). https://doi.org/10.1007/s12094-019-02275-9
- Malignant mesothelioma
- Microsatellite instability