Despite a decline in global incidence, gastric cancer (GC) remains a major health concern. The development of GC is a sequential, multistage maladaptive process involving numerous different factors. Understanding the complexity of GC development is crucial for early detection, effective treatment, and, ultimately, prevention. In this respect, identifying the impact of risk factors contributing to the emergence or progression of GC, such as Helicobacter pylori infection, host and bacterial genetics, alcohol consumption, smoking, and preserved foods, will aid in combatting this disease. In this review, we focus on recent developments in understanding the role of the microbiome, dysfunctional molecular pathways, and immune evasion in gastric pathophysiology. We also highlight challenges and advances in treatment of GC.
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