NIBAN1 (niban apoptosis regulator 1) is a protein with context-dependent roles in cellular stress responses and cell death pathways. Primary function: NIBAN1 regulates phosphorylation of translation-regulatory proteins including EIF2A, EIF4EBP1, and RPS6KB1, and participates in endoplasmic reticulum (ER) stress responses 1. Mechanism: NIBAN1 expression is induced downstream of ER stress through the PERK-eIF2α-ATF4 signaling axis 1. In oral squamous cell carcinoma, phenformin-induced NIBAN1 upregulation promotes autophagic and apoptotic cell death 1. Disease relevance: NIBAN1 serves as a molecular marker of cystic cells in nephronophthisis, a genetic cause of childhood end-stage renal disease, where it is specifically expressed in arrested distal convoluted tubule cells undergoing cystogenesis 2. In renal interstitial fibrosis, NIBAN1 expression is decreased in tubular cells, and its suppression increases apoptosis 3. Clinical significance: NIBAN1 is a prognostic biomarker in bladder cancer and was identified in an exome-wide association study as associated with variable drug response to nonchemotherapy agents in acute myeloid leukemia patients 4, 5. These findings suggest NIBAN1 has potential utility in predicting treatment outcomes and understanding disease pathogenesis across multiple malignancies and renal diseases.