UTP3 is an essential nucleolar protein and core component of the small subunit (SSU) processome, a large ribonucleoprotein complex that mediates ribosomal small subunit biogenesis 1. UTP3 functions primarily in 18S rRNA maturation and processing through its role in the SSU processome, which orchestrates pre-rRNA folding, modification, cleavage, and targeted degradation by the RNA exosome 1. Beyond ribosome biogenesis, UTP3 serves a 'ferrying' function, facilitating nucleolar localization of multiple SSU processome components (MPP10, UTP25, EMG1, UTP12, UTP13) through interaction with nuclear importin α, and recruits the RNA exosome component EXOSC10 to degrade aberrantly processed 5'ETS products 1. Clinically, UTP3 dysregulation is implicated in multiple cancers. In hepatocellular carcinoma, elevated UTP3 independently predicts poor survival (HR=1.574, p=0.007) and associates with immunosuppressive features and NF-κB pathway activation 2. In esophageal squamous cell carcinoma, the lncRNA HCP5 stabilizes UTP3 against TRIM29-mediated ubiquitination, enabling UTP3 to recruit c-Myc and suppress caspase-dependent apoptosis, promoting chemoresistance 3. UTP3 also appears upregulated in colorectal cancer and osteosarcoma with prognostic significance 45.