Redefining malignant pleural mesothelioma types as a continuum uncovers immune-vascular interactions.

Background: Malignant Pleural Mesothelioma (MPM) is an aggressive disease related to asbestos exposure, with no effective therapeutic options.

Methods: We undertook unsupervised analyses of RNA-sequencing data of 284 MPMs, with no assumption of discreteness. Using immunohistochemistry, we performed an orthogonal validation on a subset of 103 samples and a biological replication in an independent series of 77 samples.

The RAS-related GTPase RHOB confers resistance to EGFR-tyrosine kinase inhibitors in non-small-cell lung cancer via an AKT-dependent mechanism.

Although lung cancer patients harboring EGFR mutations benefit from treatment with EGFR-tyrosine kinase inhibitors (EGFR-TKI), most of them rapidly relapse. RHOB GTPase is a critical player in both lung carcinogenesis and the EGFR signaling pathway; therefore, we hypothesized that it could play a role in the response to EGFR-TKI In a series of samples from EGFR-mutated patients, we found that low RHOB expression correlated with a good response to EGFR-TKI treatment while a poor response correlated with high RHOB expression (15.3 versus 5.

PDGF activation in PGDS-positive arachnoid cells induces meningioma formation in mice promoting tumor progression in combination with Nf2 and Cdkn2ab loss.

The role of PDGF-B and its receptor in meningeal tumorigenesis is not clear. We investigated the role of PDGF-B in mouse meningioma development by generating autocrine stimulation of the arachnoid through the platelet-derived growth factor receptor (PDGFR) using the RCAStv-a system. To specifically target arachnoid cells, the cells of origin of meningioma, we generated the PGDStv-a mouse (Prostaglandin D synthase).

Miniaturized handheld confocal microscopy identifies focal brain invasion in a mouse model of aggressive meningioma.

Invasion of the brain parenchyma by a meningioma classified by histological criteria as World Health Organization (WHO) grade I meningioma, implies that the tumor has greater likelihood of recurrence and a biological behavior similar to the more aggressive WHO grade II meningiomas. It is therefore important to detect microscopic foci of brain invasion during surgery in order to maximize the resection and/or adapt imaging follow-up. In this study, we tested the sensitivity of two handheld confocal imaging devices to detect foci of brain invasion in two types of meningioma mouse models: in a genetically engineered mouse model and in a syngeneic xenograft model.