Grading is an important prognostic parameter for prostate adenocarcinoma and renal cell carcinoma (RCC); however, the most frequently used classifications fail to account for advances in our understanding of the diagnostic features, classification and/or behaviour of these tumors. In 2005 and 2014 the International Society of Urological Pathology (ISUP) formalised changes to Gleason scoring (GS) with the adoption of ISUP grading for prostate cancer in 2014. [Grade 1- GS 3+3, Grade 2-GS 3+4, Grade 3-GS 4+3, Grade 4-GS 8, Grade 5-GS 9-10]. Internationally the Fuhrman grading system is widely employed despite criticisms relating to its application, validity and reproducibility. In 2012 the ISUP established a grading system for RCC. [Grade 1, the nucleolus is not seen or is inconspicuous and basophilic at 400x magnification. Grade 2, nucleoli are eosinophilic and clearly visible at 400x magnification. Grade 3, nucleoli are clearly visible at 100x magnification. Grade 4, tumors show extreme pleomorphism or rhabdoid and/or sarcomatoid morphology]. This grading has been validated for clear cell RCC and papillary RCC. It was further recommended that chromophobe RCC not be graded. For other morphotypes of RCC ISUP grading has not been validated as a prognostic parameter, but can be used for descriptive purposes. This article is protected by copyright. All rights reserved.