Hepatocellular carcinoma (HCC) has become the third leading cause of death from cancer worldwide, and PI3K/AKT signaling pathway acts as the most common oncogenic pathway in HCC. But few studies have reported the prognostic value of PI3K/AKT associated genes (PAGs) and their association with immune infiltration. Hence, we downloaded the mRNA sequencing data and clinical information from The Cancer Genome Atlas (TCGA), GSE14520 dataset of Gene Expression Omnibus (GEO) and International Cancer Genome Consortium (ICGC) database. The 105 PAGs gene sets were from the Gene set enrichment analysis (GSEA) website. The biological processes of differently expressed PAGs were explored by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis. Then 4 prognostic PAGs (SFN, PRKAA2, PITX2 and CDK1) were identified through univariate and multivariate analyses. A prognostic signature was built base on the four PAGs. Afterward, the high-risk group had shorter survival time in Kaplan-Meier (KM) curves. Receiver operating characteristic (ROC) curves showed a better prognostic value of risk score (ROC=0.736) compared with other clinicopathological characteristics (AUC ≤ 0.511). The consistent results were obtained in the testing groups involving the GSE14520 dataset and ICGC database. The nomogram predicted the 1-year, 3-year, and 5-year overall survival rates in HCC. The correlation among risk score and immune infiltration of monocytes and M0 macrophages were determined, the expression levels of immune checkpoints (PDCD1, CTLA4, TIM3 and TIGIT) were also related to risk score in HCC. The study provided novel insight into the new targets for immunotherapy in HCC.

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This is a list of supplementary files associated with this preprint. Click to download.
Fig. S1. (a-d) Expressions of the four identified PAGs between HCC and normal samples. (e-h) Overall survival rates in K-M curves to verify the prognostic value of four PAGs in HCC.
Fig. S2. (a) Expressions of four identified PAGs in ONCOMINE database. (b) Immunohistochemistry (IHC) results showed the protein levels of three PAGs in HCC and normal tissues. (c) The genetic alteration of four PAGs in the cBioPortal database.
Fig. S3. Correlations between the risk score/four PAGs and clinicopathological characteristics of HCC patients. (a) risk score and pathology stage. (b) risk score and pathology grade. (c) risk score and pathology T classification. (d) CDK1 expression level and pathology stage. (e) CDK1 expression level and pathology grade. (f) CDK1 expression level and pathology T classification. (g) PRKAA2 expression level and pathology stage. (h) PRKAA2 expression level and pathology grade. (i) PRKAA2 expression level and pathology T classification. (j) PITX2 expression level and pathology stage. (k) PITX2 expression level and pathology T classification. (l) SFN expression level and pathology grade.
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Posted 12 May, 2021
Posted 12 May, 2021
Hepatocellular carcinoma (HCC) has become the third leading cause of death from cancer worldwide, and PI3K/AKT signaling pathway acts as the most common oncogenic pathway in HCC. But few studies have reported the prognostic value of PI3K/AKT associated genes (PAGs) and their association with immune infiltration. Hence, we downloaded the mRNA sequencing data and clinical information from The Cancer Genome Atlas (TCGA), GSE14520 dataset of Gene Expression Omnibus (GEO) and International Cancer Genome Consortium (ICGC) database. The 105 PAGs gene sets were from the Gene set enrichment analysis (GSEA) website. The biological processes of differently expressed PAGs were explored by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis. Then 4 prognostic PAGs (SFN, PRKAA2, PITX2 and CDK1) were identified through univariate and multivariate analyses. A prognostic signature was built base on the four PAGs. Afterward, the high-risk group had shorter survival time in Kaplan-Meier (KM) curves. Receiver operating characteristic (ROC) curves showed a better prognostic value of risk score (ROC=0.736) compared with other clinicopathological characteristics (AUC ≤ 0.511). The consistent results were obtained in the testing groups involving the GSE14520 dataset and ICGC database. The nomogram predicted the 1-year, 3-year, and 5-year overall survival rates in HCC. The correlation among risk score and immune infiltration of monocytes and M0 macrophages were determined, the expression levels of immune checkpoints (PDCD1, CTLA4, TIM3 and TIGIT) were also related to risk score in HCC. The study provided novel insight into the new targets for immunotherapy in HCC.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9
This is a list of supplementary files associated with this preprint. Click to download.
Fig. S1. (a-d) Expressions of the four identified PAGs between HCC and normal samples. (e-h) Overall survival rates in K-M curves to verify the prognostic value of four PAGs in HCC.
Fig. S2. (a) Expressions of four identified PAGs in ONCOMINE database. (b) Immunohistochemistry (IHC) results showed the protein levels of three PAGs in HCC and normal tissues. (c) The genetic alteration of four PAGs in the cBioPortal database.
Fig. S3. Correlations between the risk score/four PAGs and clinicopathological characteristics of HCC patients. (a) risk score and pathology stage. (b) risk score and pathology grade. (c) risk score and pathology T classification. (d) CDK1 expression level and pathology stage. (e) CDK1 expression level and pathology grade. (f) CDK1 expression level and pathology T classification. (g) PRKAA2 expression level and pathology stage. (h) PRKAA2 expression level and pathology grade. (i) PRKAA2 expression level and pathology T classification. (j) PITX2 expression level and pathology stage. (k) PITX2 expression level and pathology T classification. (l) SFN expression level and pathology grade.
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