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- W4313562022 abstract "Aims Programmed cell death ligand 1 (PD-L1) expression, used universally to predict response of non-small cell lung cancer (NSCLC) to immune-modulating drugs, is a fragile biomarker due to biological heterogeneity and challenges in interpretation. The aim of this study was to assess current PD-L1 testing practices in the UK, which may help to define strategies to improve its reliability and consistency. Methods A questionnaire covering NSCLC PD-L1 testing practice was devised and members of the Association of Pulmonary Pathologists were invited to complete this online. Results Of 44 pathologists identified as involved in PD-L1 testing, 32 (73%) responded. There was good consistency in practice and approach, but there was wide variability in the distribution of PD-L1 scoring. Although the proportions of scores falling into the three groups (negative, low and high) defined by the 1% and 50% ‘cut-offs’ (38%, 33% and 27%, respectively) reflect the general experience, the range within each group was wide at 23–70%, 10–60% and 15–36%, respectively. Conclusions There is inconsistency in the crucial endpoint of PD-L1 testing of NSCLC, the expression score that guides management. Addressing this requires formal networking of individuals and laboratories to devise a strategy for its reduction." @default.
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- W4313562022 date "2023-01-05" @default.
- W4313562022 modified "2023-10-14" @default.
- W4313562022 title "Improving practice in PD-L1 testing of non-small cell lung cancer in the UK: current problems and potential solutions" @default.
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- W4313562022 doi "https://doi.org/10.1136/jcp-2022-208643" @default.
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