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Statistics did not reveal significant differences in PD-L1 expression among the various materials (χ = 2.905; P = .574). In 50 samples from 25 patients, PD-L1 was carried out in two samples of the same patients, with moderate agreement (concordance rate 68.0%, k = 0.469). (a) PD-L1 is similarly distributed in the different materials; (b) PD-L1 shows moderate concordance in different samples of the same patients. PD-L1 may be routinely tested in cell blocks, but interpreted with caution and repeated whenever possible. (a) PD-L1 is similar