Abstract
Background
Pemetrexed is the preferred chemotherapy agent in the management of non-squamous non-small cell lung cancer (non-sq-NSCLC), but lacks biomarkers predicting its efficacy. Dexamethasone, one of the premedications of pemetrexed, may downregulate p53 through the glucocorticoid receptor (GR). The purpose of our study was to explore the effect of GR in peripheral blood mononuclear cells (PBMC) and its role in predicting pemetrexed efficacy.
Methods
In all, 122 patients with stage IV non-sq-NSCLC who received first-line pemetrexed-containing chemotherapy were retrospectively reviewed. The expression of GR in PBMC was measured before treatment with pemetrexed using real-time PCR was used to detect the levels of GRα and GRβ.
Results
The response rate for all patients was 38.5%, with a median progression-free survival (PFS) of 5.9 months and overall survival (OS) of 14.3 months. In univariate analyses, patients with a low GRα/GRβ ratio in PBMC had higher RR, better PFS, and better OS than those with a high GRα/GRβ ratio (RR: 48.2 vs. 30.3%, p = 0.043; mPFS: 6.9 vs. 4.0 months, p < 0.001; mOS: 18.7 vs. 12.2 months, p = 0.005). The baseline GRα/GRβ ratio was an independent factor for RR (odds ratio [OR] = 0.451, 95% CI 0.208–0.978; p = 0.044), PFS (HR = 1.584, 95% CI 1.094–2.295; p = 0.015), and OS (HR = 1.761, 95% CI 1.195–2.595; p = 0.004).
Conclusions
Baseline GRα/GRβ ratio in PBMC may play a role in predicting the efficacy of first-line pemetrexed-containing chemotherapy in stage IV non-sq NSCLC patients.
Abbreviations
- non-sq-NSCLC:
-
Non-small cell lung cancer glucocorticoid receptor
- PBMC:
-
Peripheral blood mononuclear cells
- PFS:
-
Progression-free survival
- OS:
-
Overall survival
- mPFS:
-
Median PFS
- mOS:
-
Median OS
- CI:
-
Confidence interval
- PCFT:
-
Proton-coupled folate transporter
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WJL and ZXM conceived the study idea. ZXM and WXH involved in conducting the molecular studies. ZXM, ZJ, LZG, WHJ, YH, and CJH involved in interpretation of the histological data. ZXM, ZJ,and WJL were involved in preparation of the manuscript. All authors read and approved the final manuscript.
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This study was funded by the National Natural Science Foundation of China (No. 81302009 and 81401892), Shanghai Municipal Commission of Health and Family Planning (No. 201440423), Shanghai Science and Technology Committee Natural Science Foundation (No. 12ZR1406400), and Clinical Research Funds of Wu Jieping Medical Foundation (No.320.6750.14278).
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The authors declare that they have no conflict 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 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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Zhao, Xm., Zhao, J., Wu, Xh. et al. Significance of glucocorticoid receptor expression in patients with non-small cell lung cancer treated with pemetrexed-based chemotherapy. Cancer Chemother Pharmacol 80, 851–860 (2017). https://doi.org/10.1007/s00280-017-3399-1
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DOI: https://doi.org/10.1007/s00280-017-3399-1