MS4A10 is a membrane-spanning protein belonging to the MS4A (membrane-spanning 4-domains A) gene family, clustered on chromosome 11 1. As a structural homologue of CD20 and the IgE receptor beta chain, MS4A10 contains four transmembrane domains with cytoplasmic N- and C-terminal domains, positioning it as a likely component of oligomeric cell surface receptor complexes involved in signal transduction 1. Unlike other MS4A family members with broad tissue expression, MS4A10 transcripts are rare and show restricted expression patterns, not detected in most hematopoietic cells or nonlymphoid tissues 1. In gastric cancer models, MS4A10 protein levels were significantly decreased following treatment with traditional Chinese medicine (SFA and matrine) combined with 5-fluorouracil, correlating with enhanced apoptosis and reduced cell proliferation 2. This downregulation of MS4A10 was associated with decreased expression of anti-apoptotic proteins and increased pro-apoptotic markers, suggesting MS4A10 may promote cell survival or proliferation in cancer contexts 2. While MS4A10 expression has been examined in cancer biology, its specific signaling mechanisms and physiological functions in normal tissues remain incompletely characterized.