Nonetheless, genetic alternations in ROS1, BRAF, RET , and MET showed a trend toward increased PD-L1 expression at lower cutoff values, but not at higher values, possibly due to the small number of positive cases involved.
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PD-L1 expression with respect to driver mutations in non-small cell lung cancer in an Asian population: a large study of 1370 cases in China.
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Nonetheless, our results were consistent in part with a previous study that showed a higher level of PD-L1 expression in patients harboring ROS1 rearrangements or MET mutations (using the 22C3 antibody, with a TPS cutoff at ⩾1% and ⩾50%), although the difference did not reach statistical significance. 23 In addition, that study also showed a similar level of PD-L1 expression regarding ALK rearrangements. 23 Nevertheless, our study did show a difference in PD-L1 expression with respect to different driver mutations and ethnic contexts.