CD274 and pneumonitis: The risk of grade 1–2 pneumonitis was higher in those who received PD‐L1 inhibitors (OR 1.47, 95% CI 1.02–2.12, p = 0.040) than in those who received PD‐1 inhibitors (I2 = 0.0%, OR 5.09, 95% CI 0.86–30.24, p = 0.074, Cross p = 0.180).