LARP1B is an RNA-binding protein belonging to the La-related protein (LARP) family that functions in mRNA regulation and immune system development. As a member of the LARP family, LARP1B shares structural features including a La-module domain that mediates RNA binding 1, though its specific mechanisms remain less characterized than LARP1. LARP1B plays a role in early and memory B cell differentiation stages, with genetic variation in LARP1B associated with adaptive immune responses 2. The protein exhibits cytoplasmic localization and associates with stress granules, consistent with roles in translational control 3. Disease relevance: LARP1B is dysregulated in multiple cancers. Circular RNA forms of LARP1B (circ-LARP1B) function as oncogenic molecules in hepatocellular carcinoma, acting as competing endogenous RNAs to regulate the miR-578/IGF1R axis, promoting cell proliferation and radioresistance 4. Similarly, circ-LARP1B drives cutaneous squamous cell carcinoma progression through the miR-515-5p/TPX2 axis 5. LARP1B was identified as a prognostically-relevant hub RNA-binding protein in HCC patient outcome prediction 6. Additionally, LARP1B emerged as a potential biomarker for pediatric asthma in machine learning-based analyses 7. These findings suggest LARP1B as a therapeutic target in cancer and inflammatory diseases.