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Construction and validation of a novel prognostic nomogram for patients with sarcomatoid renal cell carcinoma: a SEER-based study

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Abstract

Objective

The only one established prognostic nomogram for patients with sarcomatoid renal cell carcinoma (sRCC) was based on a small sample-sized study without external validation, and a nomogram can be applied to western sRCC patients has not yet been developed. Therefore, our study aimed to construct and validate an effective nomogram to predict overall survival (OS) for these patients.

Methods

The independent predictors for OS were identified and the nomogram was constructed on the basis of a retrospective study of a training cohort consisted of 428 non-Hispanic white sRCC patients registered in the Surveillance, Epidemiology and End Results (SEER) database from January 2010 to December 2015. Then, the discriminative performance of the nomogram was assessed by the concordance index (C-index). OS calibrations of the nomogram were also performed by comparing the nomogram-predicted probability to the observed survival rate. Furthermore, our nomogram was externally validated using two independent cohorts consisted of 71 non-Hispanic black patients and 82 Hispanic patients, respectively.

Results

Age at diagnosis, T stage, N stage, bone metastases, liver metastases, lung metastases and nephrectomy were identified as independent predictors for OS. In the training cohort and two validation cohorts, the C-indexes of the nomogram were 0.737, 0.801 and 0.764, respectively. Besides, excellent agreements between the nomogram prediction and the actual observation were achieved in all cohorts.

Conclusions

The current study constructed and validated an effective prognostic nomogram for patients with sRCC, which can be used to perform accurate predictions of the 0.5-, 1-, and 2-year possibilities of OS.

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Acknowledgements

This study was supported by the Natural Science Foundation Program of Shaanxi Province (No. 2014JM4184), the Boost Program Research Project of Xijing Hospital (No. XJZT13Z05) and the Military Medical Innovation Project (No. 16CXZ023).

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Correspondence to Fuli Wang or Jianlin Yuan.

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Conflict of interest

The authors declared no potential conflicts of interest with respect to the research, authorship, or publication of this article.

Ethical approval

All procedures performed in studies were in accordance with the 1964 Helsinki declaration and its later amendments or comparable ethical standards, and with the ethical standards of the institutional and national research committee.

Informed consent

The SEER database is an open database and information of patients was anonymous in the SEER database, so the current study do not require patients’ consent.

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Hou, G., Li, X., Zheng, Y. et al. Construction and validation of a novel prognostic nomogram for patients with sarcomatoid renal cell carcinoma: a SEER-based study. Int J Clin Oncol 25, 1356–1363 (2020). https://doi.org/10.1007/s10147-020-01681-2

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  • DOI: https://doi.org/10.1007/s10147-020-01681-2

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