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Jeong, Yun Seong; Eun, Young-Gyu; Lee, Sung Hwan; Kang, Sang-Hee; Yim, Sun Young; Kim, Eui Hyun; Noh, Joo Kyung; Sohn, Bo Hwa; Woo, Seon Rang; Kong, Moonkyoo; Nam, Deok Hwa; Jang, Hee-Jin; Lee, Hyun-Sung; Song, Shumei; Oh, Sang Cheul; Lee, Jeeyun; Ajani, Jaffer A; Lee, Ju-Seog
Molecular cancer, 09/2023, Volume: 22, Issue: 1Journal Article
Gastric adenocarcinoma (GAC) is a lethal disease characterized by genomic and clinical heterogeneity. By integrating 8 previously established genomic signatures for GAC subtypes, we identified 6 clinically and molecularly distinct genomic consensus subtypes (CGSs). CGS1 have the poorest prognosis, very high stem cell characteristics, and high IGF1 expression, but low genomic alterations. CGS2 is enriched with canonical epithelial gene expression. CGS3 and CGS4 have high copy number alterations and low immune reactivity. However, CGS3 and CGS4 differ in that CGS3 has high HER2 activation, while CGS4 has high SALL4 and KRAS activation. CGS5 has the high mutation burden and moderately high immune reactivity that are characteristic of microsatellite instable tumors. Most CGS6 tumors are positive for Epstein Barr virus and show extremely high levels of methylation and high immune reactivity. In a systematic analysis of genomic and proteomic data, we estimated the potential response rate of each consensus subtype to standard and experimental treatments such as radiation therapy, targeted therapy, and immunotherapy. Interestingly, CGS3 was significantly associated with a benefit from chemoradiation therapy owing to its high basal level of ferroptosis. In addition, we also identified potential therapeutic targets for each consensus subtype. Thus, the consensus subtypes produced a robust classification and provide for additional characterizations for subtype-based customized interventions.
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