Abstract
Background: Gastric cancer (GC) is one of the most common and poor prognosis malignancy in the world. The Family with sequence similarity 83 (FAM83) comprises of eight members of A–H. Accumulating evidence confirmed important roles for FAM83 family in tumorigenesis and progression. However, the prognostic values of FAM83 family in GC still have not been clarified.Methods: ONCOMINE, UALCAN, GEPIA, THE HUMAN PROTEIN ATLAS, Kaplan–Meier Plotter, cBioPortal, DAVID, STRING and TIMER databases and R software were adopted in this study.Results: In this study, we demonstrated that the mRNA levels of FAM83 B/C/D/H were significantly up-regulated in stomach adenocarcinoma (STAD), but the protein level of FAM83G/H were remarkable lowly in STAD. Next, FAM83C/D/G/H were significantly associated with tumor stages in STAD patients. Then, the mutation rate of FAM83 family members in STAD patients was 46%, and the highest mutation rate was FAM83H (23%). Furthermore, the functions of FAM83 family and their 259 co-expression genes were primarily related to Shigellosis, RNA degradation and Ribosome biogenesis in eukaryotes pathway. Besides, we have established the prognostic model of FAM83 family in STAD, including the prognostic model of STAD patients (FAM83C/D/G), STAD with lymph node metastasis (FAM83C/D/G/H) and STAD with ERBB2 high expression (FAM83G/H). FAM83C/D high expression with a poor prognosis, while FAM83G/H high expression with a favorable prognosis of STAD. Additionally, we found that the expression of FAM83C/D/G/H were significantly correlated with the infiltration of six types of immune cells [B cells, CD8+T cells, CD4+T cells, macrophages and Myeloid dendritic cells (DC)], whereas CD4+T cells and Macrophage cells have higher risk scores (HR > 1) when FAM83C lowly expression and FAM83D highly expression. The risk score of NK cells was significantly reduced when FAM83G lowly expression and FAM83H highly expression (HR < 1).Conclusion: These findings suggested that FAM83C/D/G/H might play key roles in STAD tumorigenesis and progression, and FAM83C/D might be risk factors but FAM83G/H might be favorable prognostic factors for STAD patients. In addition, CD4+T cells and Macrophage cells may be the promoters of FAM83D in progression of STAD, while NK cells may promote the protective effect of FAM83H on STAD patients.
Highlights
Gastric cancer (GC) is one of the most common malignant cancers
The results showed that the relative mRNA expression levels of the Family with sequence similarity 83 (FAM83) family in stomach adenocarcinoma (STAD) and FAM83D/H were significantly up-regulated in primary cancer tissues in multiple datasets (Figure 1)
We discovered that FAM83B/D/H expression was higher in primary cancer tissues than in normal tissues based on the analysis of GEPIA 2.0 (Figure 2B)
Summary
Gastric cancer (GC) is one of the most common malignant cancers. About 90% of patients with GC in China are already at the advanced stage at the first visit, and the overall 5-year survival rate is less than 30% (Allemani et al, 2015). The lack of effective GC diagnostic methods and reliable biomarkers may be one of the most important reasons for the low survival rate of GC. It is necessary to deeply explore the molecular mechanism of GC occurrence and development, clarify the potential molecular network of GC malignant progression, screen suitable biomarkers, and formulate effective diagnosis and treatment measures. Gastric cancer (GC) is one of the most common and poor prognosis malignancy in the world. Accumulating evidence confirmed important roles for FAM83 family in tumorigenesis and progression. The prognostic values of FAM83 family in GC still have not been clarified
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