Fig. 4
From: Expression of PD-L1 through evolution phase from pre-invasive to invasive lung adenocarcinoma
PD-L1 positive rate and expression level in AIS, MIA and pathological grade 1–3. A The percentages of PD-L1-positive (≥ 1%) samples and PD-L1-strongly-positive (≥ 50%) samples increased according to lung adenocarcinoma pathological grade 1–3 (p < 0.001). B PD-L1 expression level increased according to lung adenocarcinoma pathological grade 1–3 (**p < 0.01)