HDAC1 and nonpapillary renal cell carcinoma: Based on this observation, and considering that USP19 interacts with and deubiquitinates HDAC1/2 in order to regulate DNA damage repair and chromosomal stability (Wu et al., 2017) and that both ccRCC and HGSC are characterized by high genomic instability, it is plausible that USP19-mediated deubiquitination of key regulators associated with DSB repair or genome instability might be responsible for the worse prognosis observed in ccRCC and HGSC patients with low USP19 levels (Kang et al., 2021).