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Purpose:. Uveal melanomas (UM) are genetically simple tumors carrying few copy number alterations (CNA) and a low mutation burden, except in rare MBD4 -deficient, hypermutated cases. The genomics of uveal melanoma metastatic progression has not been described. We assessed the genetic heterogeneity of primary and metastatic MBD4 -proficient and -deficient uveal melanomas. Experimental Design: We prospectively collected 75 metastatic and 16 primary samples from 25 consecutive uveal melanoma patients, and performed whole-exome sequencing. Results:. MBD4 -proficient uveal melanomas contained stable genomes at the nucleotide level, acquiring few new single nucleotide variants (SNVs; 16 vs. 13 in metastases and primary tumors, respectively), and no.
Purpose:. The clinical use of MEK inhibitors in uveal melanoma is limited by the rapid acquisition of resistance. This study has used multiomics approaches and drug screens to identify the pan-HDAC inhibitor panobinostat as an effective strategy to limit MEK inhibitor resistance. Experimental Design: Mass spectrometry–based proteomics and RNA-Seq were used to identify the signaling pathways involved in the escape of uveal melanoma cells from MEK inhibitor therapy. Mechanistic studies were performed to evaluate the escape pathways identified, and the efficacy of the MEK-HDAC inhibitor combination was demonstrated in multiple in vivo models of uveal melanoma. Results:. We identified a number of putative escape pathways that were upregulated fol.
Purpose:. The strong association between BAP1 mutations and metastasizing Class 2 uveal melanoma (UM) suggests that epigenetic alterations may play a significant role in tumor progression. Thus, we characterized the impact of BAP1 loss on the DNA methylome in UM. Experimental Design: Global DNA methylation was analyzed in 47 Class 1 and 45 Class 2 primary UMs and in UM cells engineered to inducibly deplete BAP1. RNA-Seq was analyzed in 80 UM samples and engineered UM cells. Results:. Hypermethylation on chromosome 3 correlated with downregulated gene expression at several loci, including 3p21, where BAP1 is located. Gene set analysis of hypermethylated and downregulated genes identified axon guidance and melanogenesis as deregulated pathways,
Purpose:. Protein expression in formalin-fixed, paraffin-embedded tissue is routinely measured by IHC or quantitative fluorescence (QIF) on a handful of markers on a single section. Digital spatial profiling (DSP) allows spatially informed simultaneous assessment of multiple biomarkers. Here we demonstrate the DSP technology using a 44-plex antibody cocktail to find protein expression that could potentially be used to predict response to immune therapy in melanoma. Experimental Design: The NanoString GeoMx DSP technology is compared with automated QIF (AQUA) for immune marker compartment-specific measurement and prognostic value in non–small cell lung cancer (NSCLC). Then we use this tool to search for novel predictive markers in a cohort of.

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