CD274 and thymoma: Among 302 patients with thymomas, immuno-positivity for PD-L1 was <1%, 1–5%, 5–10%, 10–25%, and over 50% of TPS in 4.5 % (14/302), 10.6% (33/302), 10.6% (33/302), 15.2% (47/302) 17.7% (55/368) and 38.7% (120/302), respectively (Figure 1A).