Immediate Progressive Disease in Patients with Metastatic Renal Cell Carcinoma Treated with Nivolumab: a Multi-Institution Retrospective Study

On-treatment C-reactive protein control could predict response to subsequent anti-PD-1 treatment in metastatic renal cell carcinoma

OBJECTIVE

The aim of this study was to evaluate the clinical significance of the on-treatment C-reactive protein (CRP) status during systemic treatment as the predictive marker for the response of subsequent nivolumab monotherapy in patients with refractory metastatic renal cell carcinoma (mRCC).

PATIENTS AND METHODS

A total of 73 mRCC patients treated with nivolumab were retrospectively reviewed. We evaluated the serum CRP levels before and after molecular-targeted treatments. Patients whose CRP did not exceed baseline value were defined as the CRP-control group and the others were defined as the CRP-progression group. The clinical impact of CRP-control on the efficacy of nivolumab was assessed.

RESULTS

Twenty-four patients (33%) were categorized into the CRP-control group. The CRP-control group patients (median PFS not reached) had significantly longer PFS than the CRP-progression group (median PFS 11.9 months, 95% confidence interval, CI 4.1-19.8, p = 0.038). The CRP-control group had a tendency of longer OS from nivolumab initiation than the CRP-progression group (p = 0.071). By multivariate analysis, the on-treatment CRP-control was the independent predictive factor for PFS (hazard ratio HR 0.37, 95% CI 0.14-0.99, p = 0.047).

CONCLUSION

The on-treatment CRP-control could be the predictive factor for the efficacy of nivolumab in refractory mRCC patients.

Predictive Impact of Peripheral Blood Markers and C-Reactive Protein in Nivolumab Therapy for Metastatic Renal Cell Carcinoma

BACKGROUND

Predictive factors that can be routinely used in clinical practice are critically needed for immune checkpoint inhibitor therapy in metastatic renal cell carcinoma (mRCC).

OBJECTIVE

To comprehensively analyze the predictive impact of peripheral blood markers and C-reactive protein (CRP) in nivolumab therapy for mRCC.

METHODS

Fifty-eight patients were retrospectively evaluated. We evaluated neutrophil-to-lymphocyte ratio (NLR), monocyte-to-lymphocyte ratio (MLR), platelet-to-lymphocyte ratio (PLR), absolute eosinophil count (AEC), and absolute monocyte count (AMC) as peripheral blood markers as well as serum CRP levels. The primary endpoints were progression-free survival (PFS) and overall survival (OS) after nivolumab initiation.

RESULTS

Median PFS was significantly shorter in patients with high NLR (≥ 3) versus low NLR (p = 0.0356), high MLR (≥ 0.3) versus low MLR (p = 0.0013), or high PLR (≥ 160) versus low PLR (p = 0.0073), and median OS was significantly shorter in patients with high NLR versus low NLR (p = 0.0025), high MLR versus low MLR (p = 0.0025), high PLR versus low PLR (p = 0.0256), or high CRP (≥ 1.0 mg/dl) versus low CRP (p = 0.0006). Multivariate analyses showed that MLR (HR 2.65, p = 0.0068) was an independent factor for PFS and that NLR (HR 3.34, p = 0.0218), MLR (HR 3.42, p = 0.0381), and CRP (HR 4.98, p = 0.0108) were independent factors for OS.

CONCLUSIONS

The systemic inflammatory factors NLR, MLR, and CRP were predictive factors in nivolumab therapy for mRCC. These easily monitored factors can contribute to effective treatment and follow-up.