Original Study
Effect of Systemic Inflammation on Survival in Patients With Metastatic Renal Cell Carcinoma Receiving Second-line Molecular-targeted Therapy

https://doi.org/10.1016/j.clgc.2017.01.018Get rights and content

Abstract

Background

The role of systemic inflammatory markers, including C-reactive protein (CRP), the neutrophil/lymphocyte ratio (NLR), and the platelet/lymphocyte ratio (PLR), in predicting survival for patients with metastatic renal cell carcinoma receiving second-line molecular-targeted therapy (mTT) after first-line tyrosine kinase inhibitor failure remains unclear. Thus, we investigated the relationship between systemic inflammation and survival in such patients.

Patients and Methods

Sixty-three patients were evaluated. Progression-free survival (PFS) and overall survival (OS) after second-line mTT initiation were evaluated according to the inflammatory marker levels. In addition, the prognostic factors for survival were examined.

Results

The receiver operating characteristic curves for CRP, NLR, and PLR had areas under the curve of 0.779, 0.619, and 0.655, respectively; no significant differences were noted. The corresponding cutoff values were 0.48, 2.53, and 183. Patients with higher CRP (n = 40), NLR (n = 32), and PLR (n = 22) levels had significantly lower PFS and OS than those with lower CRP, NLR, and PLR levels. Multivariate analyses showed that CRP was the sole independent predictor for PFS and OS.

Conclusion

Systemic inflammation is associated with survival after second-line mTT. In particular, CRP was a strong independent predictive biomarker of prognosis.

Introduction

The current treatment strategy for metastatic renal cell carcinoma (mRCC) consists of molecular-targeted therapy (mTT) to improve and prolong patient survival.1 To further improve treatment strategy and, consequently, patient survival, identifying the predictive factors or risk classifications is necessary.

The functional relationship between systemic inflammation and cancer is well recognized.2, 3 The tumor microenvironment, which is orchestrated by inflammatory cells, is an indispensable factor in the neoplastic process, fostering cell proliferation, survival, and migration.4 In RCC, an association between systemic inflammation and prognosis has been demonstrated. C-reactive protein (CRP) has been identified as an independent predictive biomarker for survival in patients with RCC with or without metastasis.5, 6, 7, 8, 9 Moreover, the neutrophil/lymphocyte ratio (NLR) has been identified as an effective predictor in patients with mRCC receiving mTT.10, 11 These relationships have been attributed to the mechanism by which RCC cells produce inflammatory cytokines, such as interleukin-6, inducing CRP, and neutrophils.12, 13, 14, 15 Furthermore, the platelet/lymphocyte ratio (PLR) has been identified as a predictive biomarker in patients with cancer, including RCC.16, 17, 18 Several platelet-derived cytokines related to tumor angiogenesis regulation, such as vascular endothelial growth factor, basic fibroblast growth factor, and platelet-derived growth factor, have been found to be elevated in patients with cancer.19, 20

In a recent retrospective largescale study, the neutrophil and platelet levels were independent predictive factors of the prognosis in patients with mRCC who had received second-line mTT after progression during first-line therapy.21 Therefore, we hypothesized that the NLR and/or PLR would also be associated with patient survival after second-line mTT. To the best of our knowledge, the effect of the NLR or PLR in predicting survival in the second-line setting remains unclear, although this has been demonstrated in first-line therapy.10, 18 Moreover, the association among systematic inflammatory markers, including CRP, NLR, and PLR, in the second-line setting is unknown.

Thus, we investigated the correlation among systemic inflammatory markers (CRP, NLR, and PLR) and the influence of these biomarkers in predicting the survival of patients with mRCC receiving second-line mTT after first-line tyrosine kinase inhibitor (TKI) failure.

Section snippets

Patient and Study Design

Of the 115 patients who had received second-line mTT at our department from January 2007 to August 2016, 52 were excluded. The reasons for exclusion were previous cytokine therapy (n = 23), previous dialysis therapy (n = 6), second-line mTT because of adverse events during first-line therapy (n = 11), mammalian target of rapamycin inhibitor (mTORi) as a first-line agent (n = 7), and missing data (n = 5). The remaining 63 patients were evaluated. The clinical and laboratory data were obtained

Patient Background

The patient characteristics are listed in Table 1. Of the 63 patients, 36 were ≥ 65 years old (57.1%), and 44 were men (69.8%). Clear cell carcinoma (CCC) was observed in 48 patients (76.2%), and non-CCC, including papillary RCC, CCC with spindle cells, Bellini duct carcinoma, medullary carcinoma, mucinous tubular and spindle cell carcinoma, and unknown, was observed in 5 (7.94%), 4 (6.35%), 1 (1.59%), 1 (1.59%), 1 (1.59%), and 3 (4.76%) patients, respectively. Previous nephrectomy had been

Discussion

A close relationship between systemic inflammation and prognosis in RCC has been recognized. Chronic systemic inflammation caused by CRP or neutrophils produced by cancer cells can affect the host's nutritional condition, resulting in a poor prognosis, by directly accelerating tumor growth and dissemination or impairing treatment tolerability.24, 25 Moreover, lymphocytes play a role in the host's immunity against cancer and are thought to possess an antitumor effect by inducing cell apoptosis,

Conclusion

Systemic inflammatory markers (specifically, CRP, NLR, and PLR) have prognostic value for PFS and OS in patients with mRCC receiving second-line mTT after first-line TKI failure. Furthermore, CRP was demonstrated to be a strong independent predictive biomarker. Patients with systemic inflammation have a poor prognosis despite second-line therapy initiation. Therefore, careful follow-up must be performed for such high-risk patients. In addition, these markers could be used to determine the best

Disclosure

T. Kondo has received honoraria from Pfizer, Bayer, and Novartis. The remaining authors declare that they have no competing interests.

Acknowledgments

We thank Nobuko Hata (Tokyo Women's Medical University) for secretarial support and Editage for English language editing.

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