HSPA1B (heat shock protein family A member 1B) is a member of the HSP70 family that functions as an ATP-dependent molecular chaperone involved in protein folding, cellular stress response, and maintaining proteostasis 1. The protein exhibits ATP hydrolysis activity and ATP-dependent protein disaggregase activity, operating primarily in the cytoplasm and cytosol during cellular heat acclimation 1. HSPA1B plays critical roles in disease pathogenesis across multiple conditions. In cancer, it is highly expressed in late-stage hepatocellular carcinoma and colon cancer liver metastases, where it contributes to immunosuppressive tumor microenvironments and stress response states in T cells 23. In cardiovascular disease, HSPA1B is upregulated in acute myocardial infarction and associated with ferroptosis and hypoxia responses 4. The gene shows significant clinical relevance through genetic polymorphisms that influence disease susceptibility. HSPA1B variants are associated with increased risk of idiopathic male infertility, asthma susceptibility, and diabetic complications 567. Additionally, elevated HSPA1B expression serves as a diagnostic marker for tophi in gout patients 8. In neurodegenerative diseases, HSPA1B mRNA sequestration into stress granules contributes to ALS pathogenesis by impairing protein aggregate clearance 1. These findings highlight HSPA1B's dual role as both a protective chaperone and a disease modifier depending on cellular context.