NIBAN2 (niban apoptosis regulator 2) is a multi-functional protein with emerging roles in cancer progression and bone homeostasis. Functionally, NIBAN2 suppresses apoptosis and regulates alternative splicing of key transcription factors. In glioma, NIBAN2 is highly upregulated and correlates with tumor grade; it stimulates glioma growth by activating the JAK2/STAT3/c-Myc pathway, promoting cell cycle progression while preventing apoptosis 1. NIBAN2 also promotes melanoma cell invasion in vitro and trophectodermal cell invasion through endometrial extracellular vesicles during embryo implantation 2. The protein interacts with the HNRNPU-cored spliceosome complex to regulate RUNX2 alternative splicing, promoting osteoblast differentiation; NIBAN2 knockout in osteoblasts causes bone loss 3. Mechanistically, NIBAN2 functions as a transcriptional coactivator and exhibits cadherin-binding capacity at adherens junctions. Clinically, NIBAN2 expression negatively correlates with bone loss in osteoporosis patients, and its overexpression rescues bone loss in mouse models 3. These findings suggest NIBAN2 as a potential therapeutic target for both cancer progression and osteoporosis.