Title:Identification and Validation of Co-Expressed Immune-Related Gene
Signature Affecting the Pattern of Immune Infiltrating in Esophageal Cancer
Volume: 26
Issue: 4
Author(s): Rui Cheng, Hao Zeng, Linyan Chen, Lixing Zhou and Birong Dong*
Affiliation:
- National Clinical Research Center for Geriatrics, West China Hospital, Sichuan University, No. 37 GuoXueXiang,
Chengdu, China
- Center of Gerontology and Geriatrics, West China
Hospital, Sichuan University, No. 37 GuoXueXiang, Chengdu, China
Keywords:
WGCNA, immune microenvironment, immunotherapy, esophageal cancer, pathological verification, immune infiltration.
Abstract:
Objective: Esophageal squamous cell carcinoma (ESCC) is a common malignant tumor
of the digestive tract, and its molecular mechanisms have not been fully clarified. This study aimed
to evaluate the immune infiltration pattern of esophageal cancer through a gene co-expression network,
and to provide biomarkers for immunotherapy of esophageal cancer.
Methods: We downloaded RNA-seq data of ESCC samples from GSE53625 and GSE66258 datasets,
then assessed the immune score and tumor purity through the ESTIMATE algorithm. Next,
a co-expression network was constructed by the weighted gene co-expression network analysis,
and the key co-expressed immune- related genes were identified on the basis of existing human
immune-related genes. Afterward, we utilized bioinformatics algorithms including GSVA,
CIBERSORT, and ssGSEA to clarify the relationship between hub genes and immune infiltration
patterns. Finally, these hub genes were used to evaluate the sensitivity to immunotherapy by the
subclass mapping algorithm, which were further validated by digital pathology through the Hover-
Net algorithm.
Results: Sixteen immune-related genes with robust expression characteristics were identified and
used to build gene signatures. The expression of gene signature was significantly related to the
immune infiltration pattern and immunotherapy sensitivity prediction in patients with esophageal
cancer. Consistent with previous studies, genetic changes at the level of somatic mutations such as
NFE2L2 were revealed.
Conclusion: A total of 16 immune-related genes with the total expression gene signature can be
used as biomarkers for immunotherapy of esophageal squamous cell carcinoma. Its molecular
mechanisms deserve further study to guide clinical treatment in the future.