C‐reactive protein/albumin ratio is a predictive factor for prognosis in patients with metastatic renal cell carcinoma
Authors: Konishi Sakae , Hatakeyama Shingo , Tanaka Toshiaki , Ikehata Yoshinori , Tanaka Toshikazu , Hamano Itsuto , Fujita Naoki , Yoneyama Tohru , Yamamoto Hayato , Yoneyama Takahiro , Hashimoto Yasuhiro , Yoshikawa Kazuaki , Kawaguchi Toshiaki , Masumori Naoya , Kitamura Hiroshi , Ohyama Chikara 
Published: July 2019

Objectives

To evaluate the effect of pretreatment C‐reactive protein/albumin ratio and modified Glasgow prognostic score on the prognosis in patients with metastatic renal cell carcinoma.

Methods

A retrospective study was carried out in 176 patients with metastatic renal cell carcinoma who received first‐line tyrosine kinase inhibitors. The effect of adding inflammatory prognostic scores to the International Metastatic Renal Cell Carcinoma Database Consortium model (International Metastatic Renal Cell Carcinoma Database Consortium‐C‐reactive protein/albumin ratio and International Metastatic Renal Cell Carcinoma Database Consortium‐Glasgow prognostic score models) on overall survival was evaluated using receiver operating characteristic curves. The prognostic value of inflammatory prognostic scores (C‐reactive protein/albumin ratio‐modified Glasgow prognostic score) was tested using the Kaplan–Meier method and Cox proportional regression models.

Results

Patients were stratified into two groups using the cut‐off value of 0.05: C‐reactive protein/albumin ratio‐low (<0.05) and C‐reactive protein/albumin ratio‐high (≥0.05). The area under the curve was significantly higher in the International Metastatic Renal Cell Carcinoma Database Consortium‐C‐reactive protein/albumin ratio model (0.720) than that of the International Metastatic Renal Cell Carcinoma Database Consortium model (0.689) and the International Metastatic Renal Cell Carcinoma Database Consortium‐modified Glasgow prognostic score model (0.703). Significant differences were observed in overall survival stratified by the number of risk factors in the International Metastatic Renal Cell Carcinoma Database Consortium‐C‐reactive protein/albumin ratio risk model between one or two and three or four factors (P < 0.001), and three or four and five or more factors (P = 0.001). For the patients in the International Metastatic Renal Cell Carcinoma Database Consortium intermediate‐risk group, overall survival was significantly different between the C‐reactive protein/albumin ratio‐low and ‐high groups (P = 0.001), whereas it was not significantly different between the patients with one and two International Metastatic Renal Cell Carcinoma Database Consortium risk factors (P = 0.106).

Conclusion

The C‐reactive protein/albumin ratio is a simple and independent predictor of overall survival in patients with metastatic renal cell carcinoma. The predictive activity was significantly improved in the International Metastatic Renal Cell Carcinoma Database Consortium‐C‐reactive protein/albumin ratio model compared with the International Metastatic Renal Cell Carcinoma Database Consortium/International Metastatic Renal Cell Carcinoma Database Consortium‐modified Glasgow prognostic score models.