Prognostic Impact of Tissue Inhibitor of Metalloproteinase-1 in Non-Small Cell Lung Cancer: Systematic Review and Meta-Analysis.
Tissue inhibitor of metalloproteinase-1 (TIMP-1) is a multifunctional natural matrixin inhibitor that is generally considered a negative regulator of cancer metastasis. Clinical studies reporting the prognostic value of TIMP-1 in non-small cell lung cancer (NSCLC) are inconsistent. Therefore, the present study aimed to determine the prognostic impact of TIMP-1 expression in NSCLC. Appropriate studies with full-text articles were identified in searches of the China National Knowledge Infrastructure (CNKI), Cochrane Library, PubMed, and Web of Science databases up to March 7, 2018. The pooled hazard ratio (HR) of overall survival with a 95% confidence interval (95% CI) was employed to assess the relationship between expression of TIMP-1 and NSCLC patient survival. The meta-analysis comprised 40 studies including 3,194 patients. Study outcomes indicated that high TIMP-1 expression is independently associated with poor overall survival (HR: 1.60; 95% CI: 1.50, 1.69; P < 0.00001) with 61% of heterogeneity. In addition, we analyzed subgroups, including ethnicities, histological types, percentage of TIMP-1 expression levels, specimens, and tumor stage. All results were statistically significant. The outcome of our meta-analysis indicates that high expression levels of TIMP-1 are correlated with poor prognosis in patients with NSCLC. Expression levels of TIMP-1 represent a potential prognostic biomarker in NSCLC patients in addition to being a possible therapeutic target.