CD274 and neoplasm: The detection rate of CTCs was comparable between patients with: non‐resectable versus resectable (OR 1.59 [95% CI 0.49–5.14], P = 0.43), non‐squamous versus squamous (OR 0.64 [95% CI 0.20–1.94], P = 0.45), negative versus positive PD‐L1 expression (OR 0.86 [95% CI 0.13–6.44], P = 1.0) and non‐high versus high PD‐L1 expression tumours (OR 0.92 [95% CI 0.29–2.78], P = 1.0), or M1 versus M0 disease stages (OR 1.18 [95% CI 0.40–3.50], P = 0.80).