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Transcriptional Profiling Identifies Prognostic Gene Signatures for Conjunctival Lymphoma

ABSTRACT: This study characterizes the transcriptional profile and the cellular tumor microenvironment of conjunctival lymphoma and identifies prognostically relevant biomarkers. 10 formalin-fixed and paraffin-embedded conjunctival lymphoma and 8 healthy conjunctival specimens were analyzed by MACE RNA sequencing. The 3,417 upregulated genes in conjunctival lymphoma were involved in processes such as B cell proliferation and Rac protein signaling, whereas the 1,188 downregulated genes contributed most significantly to oxidative phosphorylation and UV protection. The tumor microenvironment, as determined by deconvolution analysis, was mainly composed of multiple B cell subtypes which reflects the tumor’s B cell lineage. However, several T cell types, including T helper 2 cells and regulatory T cells, as well as innate immune cell types, such as anti-inflammatory macrophages and plasmacytoid dendrit-ic cells, were also strongly enriched in conjunctival lymphoma. A 13-biomarker prognostic panel, including S100A8 and S100A9, classified ocular and extraocular tumor recurrence, exceeded prognostic accuracy of Ann Arbor and AJCC staging, and demonstrated prognos-tic value for patient survival in 21 different cancer types in a database of 12,332 tumor pa-tients. These findings may lead to new options of targeted therapy and may improve prog-nostic prediction for conjunctival lymphoma.

ORGANISM(S): Homo sapiens

PROVIDER: GSE218618 | GEO | 2023/01/25

REPOSITORIES: GEO

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Project description:Purpose: To characterize the transcriptome and cellular the tumor microenvi-ronment of conjunctival melanoma (CM) compared to healthy conjunctiva and to analyze the transcriptional differences between CM with good and poor clinical outcome. Methods: Twelve formalin-fixed and paraffin-embedded (FFPE) CM of twelve patients were analyzed by Massive Analysis of cDNA Ends (MACE) RNA se-quencing. Six samples each with good and poor clinical outcome were exam-ined, the latter being defined by local recurrence or systemic metastases with a follow-up of at least 24 months. Eight age-matched healthy FFPE conjunctival specimens from eight patients who underwent retinal detachment surgery served as controls. Bioinformatic cell type enrichment analysis with xCell was used to characterize the tumor microenvironment (TME). Differentially expressed genes (DEG) and the associated biological processes were analyzed between CM and control conjunctiva. Additionally, a prognostic transcription profile was identified by comparing melanoma of good and poor clinical outcome. Results: The TME of conjunctival melanoma was characterized by the enrich-ment of melanocytes, pericytes and especially several immune cell types. Among them, plasmacytoid dendritic cells (pDC), natural killer T cells (NKT), B cells and mast cells were most significantly increased in CM compared to healthy conjunc-tiva. DEG between CM and control were mainly involved in biological processes such as inhibition of apoptosis, proteolysis and response to growth factors. POU3F3, BIRC5 and 7 were among the top expressed genes associated with inhibition of apoptosis. Twenty genes, among them CENPK, INHA, USP33 and CASP3, were identified as prognostically relevant factors reaching high classifi-cation accuracy (AUC: 1.0). Conclusions: The present study provides new insights into the TME and the transcriptional profile of CM and additionally identifies new prognostic bi-omarkers. These results might lead to new diagnostic and therapeutic options for CM.

Project description:Circulating tumor cells (CTCs) are critical in the development of distant organ tumor metastasis, and are associated with advanced cancer stage and poor patient outcome. Here, we present the first genome-wide nucleotide-level characterization of CTCs. Our single-nucleotide polymorphism (SNP) analysis in patients with melanoma involved: 1) global comparative genomic analysis of CTCs and matched regional metastases, 2) identification of key genomic aberrations in CTCs, 3) verification of these target genes in aggressive distant tumor metastases, and 4) evidence of selective expression and functional consequence of CTC-associated genes in melanomas. We report 131 aberrant loci in CTCs that are potentially pro-metastatic, and show that such expression of a 5-marker gene panel (CSMD2, CNTNAP5, FLJ14051, ADAM6, TRPM2) in melanomas confers prognostic utility. Successful treatment of melanoma requires understanding of the metastatic process and identification of patients with tumors most likely to develop aggressive metastatic disease. Melanomas are heterogeneous, and CTCs have long been recognized as vehicles for cancer spread, representing particularly aggressive tumor clones that can evolve into successful clinical metastases. Elucidation of genomic aberrations in CTCs will aid in the development of prognostic biomarkers and therapeutic strategies to target CTCs to prevent or control distant cancer spread. This study provides the first detailed genomic confirmation of the close relation between CTCs and tumor metastases, and illustrates how CTCs can be utilized as a novel approach and rational source for identification of pro-metastatic genes in cancer research. Three individual patient cohorts were utilized in the study. CNV and LOH loci were evaluated initially in metastatic melanoma patients (n=13) in a discovery cohort. SNP loci that harbored CNV/LOH in CTCs were then separately verified for: (a) presence in distant organ metastasis (AJCC Stage IV melanoma) (n=27), and (b) relevance to prognosis in regional melanoma metastasis (AJCC Stage III melanoma) (n=35). The first discovery patient cohort group was utilized for capture of CTCs, and consisted of peripheral blood mononuclear cell (PBMC) and tumor specimens from metastatic melanoma patients (n=13). CTC-related loci were verified in a second cohort of patients with Stage IV distant organ metastases (n=27), including 15 brain, 4 lung, and 8 gastrointestinal (bowel, liver) metastases. The third patient cohort consisted of early passage (<12) established melanoma cell lines derived from 35 regional melanoma metastases (Stage III) for evaluation of the prognostic utility of the CTC-associated aberrant loci.

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Transcriptional Profiling Identifies Prognostic Gene Signatures for Conjunctival Lymphoma

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