Receptor tyrosine kinase-like orphan receptor 1 (ROR1), a receptor tyrosine kinase activated by Wnt5, is mainly expressed during fetal development and plays a crucial role in processes such as neurodevelopment and angiogenesis. ROR1 is nearly absent in most adult and pediatric tissues but is overexpressed in various malignancies, including leukemia and lung and breast cancers. Its expression has been correlated with poor clinical outcomes, and therefore, it is considered a promising cancer therapeutic target.