PIK3CA and Helicobacter pylori infectious disease: Patients with EBV-positive GC were associated with having more tumors located in the upper and middle stomach, more common in lymphoepithelioma-like GC, more lymphoid stroma, fewer Helicobacter pylori (HP) infections, higher PD-L1 expression, and more PI3K/AKT pathway mutations than patients with EBV-negative GC (Table 1).