https://www.selleckchem.com/products/z-4-hydroxytamoxifen.html Senescence marker protein 30 ( ), which plays a pivotal role as a suppressor protein in cell proliferation, among other regulatory actions, is a marker of aging that shows decreased expression during senescence. Decreased has been identified in several human cancers, but its expression and role in human non-small cell lung cancer (NSCLC) remain unclear. Using tumor tissue and matched adjacent normal tissue from 341 patients with resected NSCLC, we assessed expression using immunohistochemical methods. The relationship between expression and clinicopathologic characteristics was investigated by Kaplan-Meier survival analysis and multivariate analysis. Cell viability assay, colony formation assay, EdU incorporation assay and tumor xenograft models were also performed to investigate NSCLC cell proliferation using A549 and H1299 cell lines. Recombinant lentivirus-meditated gene overexpression and Western blot were performed to clarify the underlying molecular mechanism of inhibiting NSCLC proliferation. expression was frequently downregulated in NSCLC tissue, as compared with adjacent non-tumor tissue. Kaplan-Meier survival analyses revealed NSCLC patients with low expression had a significantly worse overall survival (OS), with median OS of 18 67 months in high expression group. overexpression significantly inhibited A549 and H1299 cell proliferation both and in tumor xenografts and downregulated the expression of and protein. Moreover, Western blot analyses confirmed that SMP30 overexpression significantly inhibited the histone deacetylase 4 ( ) level in NSCLC cells, and overexpression reversed -mediated NSCLC repression both and . inhibited NSCLC proliferation by reducing expression, and and may serve as new prognostic biomarkers and future therapeutic targets for NSCLC. SMP30 inhibited NSCLC proliferation by reducing HDAC4 expression, and SMP30 and HDAC4 may serve as new prognostic biomarkers and future