RPS13 (ribosomal protein S13) is a structural component of the small ribosomal subunit essential for protein synthesis 1. As part of the small subunit processome, RPS13 participates in ribosome biogenesis within the nucleolus, contributing to pre-rRNA processing, folding, and modifications 1. Beyond its canonical ribosomal function, RPS13 demonstrates remarkable expression stability across diverse cell types and experimental conditions, making it an excellent reference gene for gene expression normalization studies 23. However, RPS13 also plays oncogenic roles in cancer progression. In gastric cancer, RPS13 is overexpressed and promotes tumor growth by accelerating G1 to S phase cell cycle transition through down-regulation of the tumor suppressor p27(Kip1) 4. Additionally, specific noncoding ultraconserved elements can act as silencers of RPS13, suggesting complex regulatory mechanisms in cancer 5. In Kaposi's sarcoma, RPS13 is downregulated and its reduced expression promotes cellular proliferation, migration, and angiogenesis 6. The protein also functions in stem cell niche homeostasis, regulating germline stem cell renewal and differentiation through Rho1-mediated signaling pathways 7. These findings reveal RPS13's dual nature as both a stable housekeeping gene and a context-dependent regulator of cellular proliferation and cancer progression.