PCIF1 and renal cell carcinoma: Additionally, querying the Clinical Proteomic Tumor Analysis Consortium (CPTAC) Kidney renal clear cell carcinoma (KIRC) cohort demonstrated marked upregulation of PCIF1 at protein level in KIRC tissues (Figure 1E), consistent with higher protein levels detected in RCC specimens from our internal cohort via western blot analysis (Figure 1F).