Fig. 2: Overview of pathology slides in two patients.

Representative images of pathology slides showed a high-density positive TILs tumour (upper) and a low-density positive TILs tumour (lower) in patients with LCNEC. HE-positive (a and f), CD4-positive (b and g), CD8-positive (c and h), FOXP3-positive (d and i) and CD20-positive (e and j) TILs in the tumour nest and stroma area are visible (Bar = 50 μm).