Abstract
Purpose
3-[18F]Fluoro-α-methyl-L-tyrosine ([18F]FAMT) is an amino acid positron emission tomography (PET) tracer specific for cancer detection by assessment of tumor amino acid metabolism. Little is known on whether or not the uptake of [18F]FAMT within cancer cells is associated with the expression of programmed death ligand-1 (PD-L1), a predictor of anti-PD-1 antibody efficacy. We conducted a clinicopathological study to assess the expression of PD-L1 and the presence of tumor-infiltrating lymphocytes (TILs) in patients with non-small cell lung cancer (NSCLC) diagnosed by PET.
Procedures
A total of 75 patients with NSCLC who underwent [18F]FAMT and 2-deoxy-2-[18F]fluoro-D-glucose ([18F]FDG) PET were enrolled in the study. Tumor specimens were stained by immunohistochemistry for glucose transporter 1 (Glut1), PD-L1 (using different antibody clones including E1L3N and 28-8), CD3, CD4, and CD8. The uptake of [18F]FAMT was correlated with clinicopathological variables.
Results
High uptake of [18F]FAMT was significantly associated with disease staging, initial treatment (surgical resection or chemotherapy), and the expression of PD-L1 (E1L3N). The value of the maximum standardized uptake value (SUVmax) for [18F]FAMT was significantly correlated with PD-L1 (E1L3N) expression, Glut1, and the SUVmax for [18F]FDG in patients with histological results of adenocarcinoma (AC) and advanced disease. A validation cohort for anti-PD-L1 using clone 28-8 showed a statistically significant correlation between SUVmax for [18F]FAMT and the expression of PD-L1 (28-8) and between the expression of PD-L1 (E1L3N) and PD-L1 (28-8).
Conclusions
The uptake of [18F]FAMT on PET imaging was significantly correlated with PD-L1 expression in NSCLC, especially in patients with AC and advanced disease.
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KK has received research grants and a speaker honorarium from Boehringer Ingelheim Company, Ono Pharmaceutical Company, Bristol-Myers Company, and Chugai Pharmaceutical Company. All remaining authors have declared no conflicts of interest.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Informed consent was obtained from all individual participants included in the study.
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Shimizu, K., Kaira, K., Higuchi, T. et al. Relationship Between Tumor Immune Markers and Fluorine-18-α-Methyltyrosine ([18F]FAMT) Uptake in Patients with Lung Cancer. Mol Imaging Biol 22, 1078–1086 (2020). https://doi.org/10.1007/s11307-019-01456-w
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DOI: https://doi.org/10.1007/s11307-019-01456-w