LARP4B is an RNA-binding protein that functions as a positive regulator of mRNA translation and stability. Structurally, it contains a La motif and RNA recognition motif (RRM) that are essential for its biological activity 1. LARP4B binds to 3' UTRs of target mRNAs and promotes their accumulation and translation through direct interactions with translation machinery 2. At the molecular level, LARP4B negatively regulates dMyc protein levels, a key growth-promoting factor, suggesting it acts as a negative regulator of cell proliferation 1. In disease contexts, LARP4B exhibits context-dependent roles in cancer. In acute myeloid leukemia, LARP4B maintains leukemia stem cell self-renewal by suppressing cell cycle inhibitors (p16, p19, p21) and promoting cell cycle progression 3. Conversely, in liver cancer, high LARP4B expression correlates with poor prognosis and shorter overall survival, suggesting an oncogenic function 4. Beyond cancer, LARP4B has been associated with rapid kidney function decline in genome-wide studies 5, and circular LARP4B regulates cardiac hypertrophy through the miR-298-5p/Mef2c axis 6. Overall, LARP4B's tissue- and context-dependent roles complicate its categorization as either oncogenic or tumor-suppressive 7.