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. 2021 May 26;11:659969. doi: 10.3389/fonc.2021.659969

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Copyright © 2021 Pei, Wang, Ren, Yin, Ma, Wang, Ma and Gao

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Clear cell renal cell carcinomas (ccRCC) with different grades. (A) Grade I ccRCC (arrow) was demonstrated. (B) Grade II ccRCC was shown (arrow). (C) Grade III ccRCC was revealed (arrow). (D) Grade IV ccRCC (arrow) was displayed.