Clinical value and potential mechanisms of COL8A1 upregulation in breast cancer: a comprehensive analysis

Abstract

Background: The situation faced by breast cancer patients, especially those with triple-negative breast cancer, is still grave. More effective therapeutic targets are needed to optimize the clinical management of breast cancer. Although collagen type VIII alpha 1 chain (COL8A1) has been shown to be downregulated in BRIP1-knockdown breast cancer cells, its clinical role in breast cancer remains unknown. Methods: Gene microarrays and mRNA sequencing data were downloaded and integrated into larger matrices based on various platforms. Therefore, this is a multi-centered study, which contains 5048 breast cancer patients and 1161 controls. COL8A1 mRNA expression in breast cancer was compared between molecular subtypes. In-house immunohistochemistry staining was used to evaluate the protein expression of COL8A1 in breast cancer. A diagnostic test was performed to assess its clinical value. Furthermore, based on differentially expressed genes (DEGs) and coexpressed genes (CEGs) positively related to COL8A1, functional enrichment analyses were performed to explore the biological function and potential molecular mechanisms of COL8A1 underlying breast cancer. Results: COL8A1 expression was higher in breast cancer patients than in control samples (standardized mean difference = 0.79; 95% confidence interval [CI] 0.55-1.03). Elevated expression was detected in various molecular subtypes of breast cancer. An area under a summary receiver operating characteristic curve of 0.80 (95% CI 0.76-0.83) with sensitivity of 0.77 (95% CI 0.69-0.83) and specificity of 0.70 (95% CI 0.61-0.78) showed moderate capacity of COL8A1 in distinguishing breast cancer patients from control samples. Worse overall survival was found in the higher than in the lower COL8A1 expression groups. Intersected DEGs and CEGs positively related to COL8A1 were significantly clustered in the proteoglycans in cancer and ECM-receptor interaction pathways. Conclusions: Elevated COL8A1 may promote the migration of breast cancer by mediating the ECM-receptor interaction and synergistically interplaying with DEGs and its positively related CEGs independently of molecular subtypes. Several genes clustered in the proteoglycans in cancer pathway are potential targets for developing effective agents for triple-negative breast cancer.

Assessment of Significant Pathway Signaling and Prognostic Value of GNG11 in Ovarian Serous Cystadenocarcinoma

“…The regulation of ECM-receptor interaction pathway was significantly associated with the metastasis of cancers such as colorectal cancer, 24 kidney cancer 25 and breast cancer. 26 Our results showed that ECM-receptor interaction was enriched in high expression group of GNG11, which indicating the migration risk of ovarian cancer. The dbDEMC analysis indicated that differential expression profile of hsa-miR-22-5p in blood was observed in ovarian cancer patients, suggesting that the tumor cells secreted the hsa-miR-22-5p into blood, and possibly caused the risk of distant metastasis and absorption by other organs.…”

The role of network‐forming collagens in cancer progression

“…In addition, the expression of COL8A1 in breast and colon cancers is significantly higher than that in normal counterparts. COL8A1‐overexpression is inversely correlated with the overall survival in patients with colon adenocarcinoma or breast cancer 16,111 . Collectively, these evidences indicate that collagen VIII promotes the progression of multiple types of cancer.…”

“…13 Overexpression of network-forming collagens was associated with various types of cancer (Figure 2). [14][15][16][17] This review intends to give an overview of the complex roles of network-forming collagens in cancer.…”

COL8A1 Predicts the Clinical Prognosis of Gastric Cancer and Is Related to Epithelial-Mesenchymal Transition

“…COL8A1 may affect the progression of colorectal cancer and the prognosis of patients by regulating focal adhesion-related pathways, and the expression of COL8A1 in colorectal cancer is related to the expression of Wnt2 and is linked to the poor survival of patients [ 28 , 29 ]. COL8A1 may promote breast cancer migration by affecting ECM receptor interactions and cooperation with other genes [ 30 ]. There are very few studies of COL8A1 in gastric cancer.…”