Sun JH, Hou JP, Kang YZ. Clinical significance of expression of PPP1R105 in hepatocellular carcinoma.
Shijie Huaren Xiaohua Zazhi 2020;
28:765-776. [DOI:
10.11569/wcjd.v28.i16.765]
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Abstract
BACKGROUND
Hepatocellular carcinoma (HCC) is a common malignant tumor with a poor prognosis. In this study, we evaluated the expression of the PPP1R105 gene in HCC and its relationship with prognosis through bioinformatics analysis. Then, we used immunohistochemistry to verify the expression of PPP1R105 protein.
AIM
To investigate the expression of PPP1R105 (Ki-67 or MKI67) in HCC and its clinical significance.
METHODS
The relative expression data of the PPP1R105 gene in various tumor tissues were retrieved from the tumor protein database and TCGA database and compared between cancer and paired normal tissues. The protein-protein interaction network (PPI) of PPP1R105 was constructed by using the STRING database. The progression free survival (DFS) and overall survival (OS) between the high and low PPP1R105 expression groups were compared. Eighty-one HCC patients who underwent surgery were retrospectively included in the study, and PPP1R105 protein expression was detected by immunohistochemistry. The relationship between PPP1R105 protein expression and patients' features was evaluated.
RESULTS
The expression levels of PPP1R105 mRNA in different tumors were not significantly different. In HCC, the expression level of PPP1R105 mRNA was significantly higher than that of normal liver tissue, and the expression level was related with clinical stage. The aggregation index of PPI was 0.99, and the enrichment of protein interaction network was significant (P < 0.01). PPP1R105 was mainly enriched in cell cycle, cell aging, virus carcinogenesis, and p53 signaling pathway. The positive correlation between KIF18B and PPP1R105 was the most significant (rperson = 0.91, P < 0.05), while the negative correlation between MCELL and PPP1R105 was the most significant (rperson = -0.59, P < 0.05). DFS (HR = 1.90, P < 0.01) and OS (HR = 1.90, P < 0.01) in the high PPP1R105 expression group were significantly shorter than those in the low expression group. PPP1R105 protein was mainly expressed in the cytoplasm and nucleolus of the cells. Of the included 81 patients, 30 (37.0%) showed high expression of PPP1R105 protein. The proportion of patients with high expression of PPP1R105 protein was higher than that of patients with low expression of MIK67 protein (P < 0.05).
CONCLUSION
PPP1R105 is highly expressed in patients with HCC, which is related to a poor DFS and OS. PPP1R105 can be used as a poor prognostic molecular marker in HCC.
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