Abstract
This editorial will focus on tumor immunity and the factors that alter the tumor immune micro-environment. The role of tumor infiltrating lymphocytes (TILs) will also be discussed in detail, including the types, mechanism of action, and role. Gastric cancer (GC) often presents in the advanced stage and has various factors predicting the outcomes. The interplay of these factors and their correlation with the TILs is discussed. A literature review revealed high intra-tumoral TILs associated with higher grade, HER2-, and Helicobacter pylori negativity. Moreover, stromal (ST) TILs correlated with lower grade and lesser recurrence risk in GC. High TILs in ST and invasive border also correlated with mismatch repair deficiency status. Further characterization of the CD3+, CD8+, and other cells is also warranted. In the future, this complex correlation of cancer cells with the immune system can be explored for therapeutic avenues.