TMEM176A is a transmembrane protein that functions as a tumor suppressor in multiple cancer types while also serving as a regulator of immune cell function. In colorectal and pancreatic cancers, TMEM176A acts as a tumor suppressor by inducing apoptosis and inhibiting cell migration, invasion, and proliferation through suppression of ERK signaling pathways 1 2. However, in gastric cancer, TMEM176A paradoxically functions as an oncogene, promoting tumor growth by driving anti-apoptotic signaling through TGM2-mediated ERK activation 3. The protein's expression is frequently silenced by promoter methylation in colorectal cancer, and methylation status serves as an independent prognostic marker for overall survival 1. In immune contexts, TMEM176A belongs to the MS4A superfamily and is expressed on type 3 innate lymphoid cells, functioning as an ion channel regulating calcium transport and acting as a molecular chaperone for immune receptor complexes 4. Elevated TMEM176A expression in chr7 spinal cord injury and familial tauopathy is associated with inhibition of dendritic cell maturation and function, potentially limiting protective immune responses 5 6. The protein also shows altered expression in COPD patients' monocytes/macrophages, suggesting broader roles in inflammatory diseases 7.