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Impact of the serum creatinine and cystatin C ratio for prediction of sarcopenia and prognosis in biliary tract cancer

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Abstract

Background

Sarcopenia is a poor prognostic factor in cancer patients. In recent years, there have been reports that serum creatinine and cystatin C (Cr/CysC) ratio is associated with sarcopenia. However, the prognostic value of the Cr/CysC ratio in biliary tract cancer is unclear. We evaluated the impact of the Cr/CysC ratio on sarcopenia and prognosis in biliary tract cancer.

Methods

We retrospectively reviewed the records of 190 patients with biliary tract cancer who had undergone surgical resection from January 2017 to March 2023. Frozen serum samples collected at the time of surgery were used to measure CysC. We calculated the Cr/CysC ratio and investigated the relationship with sarcopenia and the prognostic significance.

Results

We calculated the cutoff value of the Cr/CysC ratio for low skeletal muscle index (SMI) (< 42 cm2/m2 for males and < 38 cm2/m2 for females). The optimal cutoff value of the Cr/CysC ratio was 0.848. The low Cr/CysC ratio group was significantly associated with higher preoperative CRP and lower albumin, lower SMI, lower handgrip strength, and higher intramuscular adipose tissue content. In multivariate analysis, patients with a low Cr/CysC ratio showed poorer overall survival (hazard ratio 2.60, 95% confidence interval 1.07–6.29, p = 0.033), which was significantly worse than in those with a high Cr/CysC ratio.

Conclusions

In patients with biliary tract cancer, the Cr/CysC ratio showed weak correlation with sarcopenic indicators. However, the Cr/CysC ratio could be strong prognostic factor in biliary tract cancer.

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Acknowledgements

We thank Mr. Takumi Nagasawa, Ms. Rumi Okazaki, Ms. Azusa Uchida, Ms. Kiyomi Nakajima of Gunma University Hospital laboratory section and Ms.Harumi Kanai and Ms. Yukiko Sudo for measuring cystatin C. We thank Carol Wilsom, PhD, from Edanz (http://jp.edanz.com/ac) for editing a draft of this manuscript.

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

Authors

Contributions

R.F., N.H., M.T., and K.S. contributed to the conception and design of this study. R.F., T.O., T.S., K.H., S.K., and K.H. contributed to the acquisition of data. R.F., N.H., N.I., and T.I. contributed to the analysis and interpretation of data. R.F., N.H., M.T., K.A., and K.S. contributed to the drafting of the manuscript. R.F., N.H., M.T., K.A., and K.S. contributed to the revision of the manuscript. All authors contributed to the final approval of the manuscript.

Corresponding author

Correspondence to Norifumi Harimoto.

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Conflict of interest

The authors declare that they have no conflict of interest. The authors report no proprietary or commercial interest in any product mentioned or concept discussed in this article.

Ethical approval

The study was approved by the Gunma University Ethics Committee (HS2021-064) and complied with institutional guidelines and the Declaration of Helsinki. Patient consent for participation was obtained using the opt-out method.

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Supplementary Information

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10147_2024_2539_MOESM1_ESM.pdf

Supplementary file1 (PDF 816 KB)—Figure. 1 Correlation between Cr/CysC ratio and a SMI and b handgrip strength. The Cr/CysC ratio showed a very weak positive correlation with SMI and a weak positive correlation with grip strength. (SMI: R2 = 0.096, p < 0.001; handgrip strength: R2 = 0.20, p < 0.001). Abbreviations: Cr/CysC, creatinine and cystatin C; SMI, skeletal muscle index. Figure. 2 Kaplan–Meier curves for overall survival (OS) and recurrence-free survival (RFS) by the classifications of the creatinine and cystatin C (Cr/CysC) ratio: 0.839. a Patients in the low Cr/CysC ratio group (Cr/CysC ≤ 0.848) had significantly worse OS (p = 0.007) than those in the high Cr/CysC ratio group (Cr/CysC > 0.848). b Patients in the low Cr/CysC ratio group (Cr/CysC ≤ 0.848) had significantly worse RFS (p = 0.010) than those in the high Cr/CysC ratio group (Cr/CysC > 0.848). Abbreviations: Cr/CysC, creatinine and cystatin C. Figure. 3 Kaplan–Meier curves for overall survival (OS) and recurrence-free survival (RFS) by the classifications of the ratio of Cr and CysC estimated glomerular filtration rates (eGFRcre/eGFRcys) ratio: 1.044. a Patients in the high eGFRcre/eGFRcys ratio group (eGFRcre/eGFRcys ≥ 1.044) had significantly worse OS (p = 0.002) than those in the low eGFRcre/eGFRcys ratio group (eGFRcre/eGFRcys < 1.044). b Patients in the high eGFRcre/eGFRcys ratio group (eGFRcre/eGFRcys ≥ 1.044) had significantly worse RFS (p = 0.010) than those in the low eGFRcre/eGFRcys ratio group (eGFRcre/eGFRcys < 1.044). Abbreviations: eGFRcre/eGFRcys, ratio of Cr and CysC estimated glomerular filtration rates. Figure. 4 Kaplan–Meier curves for overall survival (OS) and recurrence-free survival (RFS) by the classifications of the creatinine and cystatin C (Cr/CysC) ratio in 107 of 190 patients who had skeletal muscle index (SMI) and handgrip strength data. Patients in the low Cr/CysC ratio group (Cr/CysC ≤ 0.848) tended to have poor OS and poor RFS, but there was no significant difference. Abbreviations: Cr/CysC, creatinine and cystatin C. Table 1. Univariate and multivariate analyses of the OS (Cr/CysC cutoff value: 0.839). Table 2. Univariate and multivariate analyses of the RFS (Cr/CysC cutoff value: 0.839). Table 3. Association between Cr/CysC ratios and sarcopenia. (Data for 107 patients measured both SMI and handgrip strength). Table 4. Association between Cr/CysC ratios and SMI.

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Fukushima, R., Harimoto, N., Okuyama, T. et al. Impact of the serum creatinine and cystatin C ratio for prediction of sarcopenia and prognosis in biliary tract cancer. Int J Clin Oncol (2024). https://doi.org/10.1007/s10147-024-02539-7

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