• 1. North China University of Science and Technology, Tangshan, 063300, Hebei, P. R. China;
  • 2. Department of Chest Tumor, Affiliated Hospital of North China University of Science and Technology, Tangshan, 063300, Hebei, P. R. China;
ZHENG Maogen, Email: 13832976291@163.com
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Objective To investigate the expression of major histocompatibility complex, classⅡ, DQ alpha 1 (HLA-DQA1) in lung adenocarcinoma and its prognostic significance. Methods The prognostic significance of HLA-DQA1 in lung adenocarcinoma was determined by constructing receiver operating characteristic (ROC) curve and Kaplan-Meier curve, and functional analysis was performed using gene ontology (GO) enrichment, Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway, and gene set enrichment analysis (GSEA). The association between the level of immune cell infiltration and HLA-DQA1 expression was evaluated using CIBERSORT and Spearman correlation analysis. Clinicopathological data of patients with lung adenocarcinoma who were hospitalized for surgical treatment at the North China University of Science and Technology Affiliated Hospital from 2022 to 2023 were collected, and the relationship between HLA-DQA1 expression and clinicopathological features of lung adenocarcinoma patients was analyzed using reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemistry in vitro experiments. Results A total of 30 patients were included in the study, including 17 females and 13 males, with 20 cases aged ≥60 years and 10 cases aged <60 years. Compared with normal tissue, the expression level of HLA-DQA1 in lung adenocarcinoma was significantly lower, as confirmed by quantitative real-time PCR (qRT-PCR) and immunohistochemistry in lung adenocarcinoma and normal lung tissue. CancerSEA, GO, and KEGG analyses indicated that HLA-DQA1 was closely related to the immune infiltration of tumor cells. Drug sensitivity analysis showed that patients with high HLA-DQA1 expression may be resistant to crizotinib treatment, while they are relatively sensitive to cisplatin, paclitaxel, docetaxel, and epidermal growth factor receptor inhibitors. Conclusion HLA-DQA1 is an important prognostic marker for patients with lung adenocarcinoma.

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