The hidden messengers: Tumor microenvironment-derived exosomal ceRNAs in gastric cancer progression.

The tumor microenvironment (TME) plays a crucial role in the development and progression of gastric cancer (GC). The TME comprises a network of cancer cells, immune cells, fibroblasts, endothelial cells, and extracellular matrix components, which provide a supportive niche for cancer cells. This study investigates the role of TME-derived exosomal competitive endogenous RNAs (ceRNAs), particularly long non-coding RNAs (lncRNAs) and circular RNAs (circRNAs), as major regulating agents in GC development. Exosomal ceRNAs control gene expression across several TME components, amplifying cancer hallmarks like cell proliferation, invasion, metastases, and chemoresistance. They promote dynamic interplay between cancer cells and adjacent stromal cells, enabling tumor development through immune suppression, angiogenesis, and epithelial-mesenchymal transition (EMT). Exosomal ceRNAs can modify the TME, creating a pro-tumorigenic milieu and preparing cancer cells to avoid immunological responses, defy death, and adapt to therapeutic pressures. This review highlights the understudied interactions between the TME and exosomal ceRNAs in gastric cancer and emphasizes their potential utility as diagnostic and therapeutic tools.