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. 2021 Sep 6;9:e12086. doi: 10.7717/peerj.12086

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©2021 Zhu et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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(A) Forest plot showing the results of univariate Cox regression analysis. (B) Forest plot showing the results of multivariate Cox regression analysis. (C) Kaplan–Meier survival analysis for PPA2 expression stratified by histologic grade. (D) Kaplan–Meier survival analysis for PPA2 expression stratified by stage. KIRC, kidney renal clear cell carcinoma.