Figure 2.

(A) CD3⁺ immunohistochemistry in small bowel neuroendocrine tumor tissue showing the tumor center (TC) and the invasive margin (IM) used to determine immune cell score: (B–E) Examples of CD3⁺, CD8⁺, CD4⁺ and FOXP3⁺ T cell infiltrations in immunohistochemical stainings. Scale bars are 1 mm (A) and 100 µm (B–E).