PD‐L1 expression was significantly associated with male gender (odds ratio [OR] 1.55, 95% CI: 1.08–2.22, P = 0.017) and higher Masaoka stage (OR 3.93, 95% CI: 2.44–6.32, P < 0.001), but not with age, tumor size and grade, and myasthenia gravis (Table 4, Fig 6a–f). Here, CD274 is linked to myasthenia gravis.