SERPINB9 and neoplasm: The IC50 for NCCIT and NTERA-2 decreased significantly after the knock down of SERPINB9. Additionally, the cell proliferation assay demonstrated significantly reduced growth of NCCIT and NTERA-2 cells following SERPINB9 knockdown, further supporting the role of SERPINB9 in promoting tumor growth (Fig. S4i–n).