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- W2955401851 abstract "Introduction: Determining immunogenicity of tumors is important in predicting response to cancer immunotherapy. Tumor mutation burden, the degree of copy number variation expressed as chromosomal instability score and gene expression profiles (GEP) of tumors, such as cytolytic activity score, interferon-gamma signature and immune signature, are known biomarkers of immunogenicity. However, correlation between methylation burden and signature of tumor immunogenicity is unknown. Methods: We used The Cancer Genome Atlas (TCGA) pan-cancer database to investigate association of RNA sequencing data and methylation signature of tumors generated by HumanMethylation450K BeadChip. The estimated methylation levels in the CpG sites were expressed in β-scores. To determine immunogenicity in a sample, we used cytolytic activity (CytAct) score defined by the summation of RNA transcript levels of granzyme A (GZMA) and perforin 1 (PRF1). In each CpG site, β-scores of top 5% and bottom 5% were defined as “hypermethylated” and “hypomethylated”, respectively. Methylation burden of a sample was defined as number of CpG sites having hypermethylated or hypomethylated β-scores. Results: In TCGA, total of 7,914 pan-cancer samples had both RNA sequencing data and methylation array data. Methylation burdens of pan-cancer samples were negatively correlated with CytAct scores. (Spearman’s correlation rho value -0.37, p Conclusions: The methylation burden of tumor has negative correlation with the immunogenicity of tumors in general pan-cancer. Correlation of the specific methylation pattern with the response of immunotherapy is warranted in further clinical study. Citation Format: Changhee Park, Kyeonghun Jeong, Joon-Hyeong Park, Jeong Mo Bae, Kwangsoo Kim, Chan-Young Ock, Miso Kim, Bhumsuk Keam, Tae Min Kim, Yoon Kyung Jeon, Dong-Wan Kim, Gyeong Hoon Kang, Doo Hyun Chung, Dae Seog Heo. Methylation landscape of cancers associated with immunogenicity [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 1498." @default.
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- W2955401851 date "2019-07-01" @default.
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- W2955401851 title "Abstract 1498: Methylation landscape of cancers associated with immunogenicity" @default.
- W2955401851 doi "https://doi.org/10.1158/1538-7445.sabcs18-1498" @default.
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