EFNA2 and gastric cancer: Figure 7A shows that the expression of EFNA1-4 in gastric cancer was significantly correlated with immune subtypes (p < 0.001, p < 0.01, p < 0.001, and p < 0.001, respectively). EFNA1-4 was highly expressed in C4. while EFNA1 was highly expressed in C1–C4, and C6. Elevated EFNA2 expression was associated with C1 infiltration.