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Objectives   Immune checkpoint blockers constitute the first-line treatment for advanced non-small-cell lung cancer (NSCLC) with ≥50% PD-L1 expression. In NSCLC, PD-L1 positivity is correlated with high  18 F-fluorodeoxyglucose ( 18 F-FDG) uptake. However, these studies only included patients undergoing surgical resection, almost all in their early stages. Moreover, differences in  18 F-FDG uptake between NSCLC with high (≥50%) and low (49%) PD-L1 expression remain unknown. We aimed to investigate the association between metabolic parameter  18 F-FDG uptake and PD-L1 expression status in NSCLC patients.Methods   From February 2017 to June 2018, 428 consecutive NSCLC patients who underwent  18 F-FDG positron emission tomography/computed tomography (PET/CT) and SP142 PD-L1 expression analysis were retrospectively assessed. The association between clinicopathological characteristics and PD-L1 expression was examined.Results   The frequency of PD-L1-positive tumors was 38.1% (163/428), 28.5% (91/319), and 64.2% (61/95) for NSCLC, adenocarcinoma (ADC), and squamous cell carcinoma (SCC), respectively. Maximal standard uptake (SUVmax) was significantly higher in PD-L1-positive than in PD-L1-negative NSCLC ( p  < 0.0001), ADC ( p  < 0.0001), and SCC ( p =0.006). SUVmax was significantly higher in NSCLC ( p =0.001) and ADC ( p =0.003) with high rather than low PD-L1 expression. The receiver operating characteristic curve yielded area under the curve values of 0.726 (95% CI, 0.679–0.774,  p  < 0.0001), 0.694 (95% CI, 0.634–0.755,  p  < 0.0001), and 0.625 (95% CI, 0.513–0.738,  p =0.044) for NSCLC, ADC, and SCC, respectively.Conclusion    18 F-FDG tumor uptake is strongly, positively correlated with PD-L1 expression in NSCLC and significantly differs between high and low PD-L1-expressing individuals.

Relationship between SP142 PD-L1 Expression and 18F-FDG Uptake in Non-Small-Cell Lung Cancer

Relationship between SP142 PD-L1 Expression and ¹⁸F-FDG Uptake in Non-Small-Cell Lung Cancer