title: Is insulin-like growth factor binding protein 2 associated with metastasis in lung cancer?
abstract: Insulin-like growth factor binding protein 2 (IGFBP2) is involved in the progression of many epithelial cancers. However, its role in non-small cell lung cancer (NSCLC), another type of epithelial cancer, remains unclear. We detected IGFBP2 expression using immunohistochemistry in surgically resected tumors from 110 NSCLC patients, 37 of which had metastases. The positive rate of IGFBP2 expression was compared between the metastatic and the non-metastatic group, and correlations of IGFBP2 expression with metastasis and overall survival were analyzed. We also investigated the expression of IGFBP2 in microvesicles (MVs) collected from primary lung cancer cell cultures, and in different locations of newly resected NSCLC tumors, using immunoblotting. The overall positive rate of IGFBP2 expression in lung cancer was 51.8 % and it was significantly higher in the metastatic group than in the non-metastatic group (70.3 and 42.5 % respectively, p < 0.01). And the higher the lymph node stage, the higher the positive rate. Cytoplasmic expression was predominant in the majority of the tumors. Based on multivariate regression analysis, IGFBP2 was correlated with metastasis and poor overall survival (Hazard ratio: 3.56 and 3.23 respectively). IGFBP2 was detectable in the MVs collected from IGFBP2 positive cell lines, and its expression was most abundant in the marginal region of the newly resected tumors. IGFBP2 is associated with metastasis and poor survival of lung cancer. Its presence in MVs and high abundance in the marginal region of tumors suggest that its association with metastasis may be related to tumor microenviroment remodeling in NSCLC.
authors.affiliation: Department of Cardiothoracic Surgery, Xiangya Hospital, Central-South University, Changsha, 410078, Hunan, China, drhqh240@163.com.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Hu
authors.forename: Lingjin
authors.initials: L
authors.lastname: Huang
authors.forename: Xuyuan
authors.initials: X
authors.lastname: Kuang
authors.forename: Heng
authors.initials: H
authors.lastname: Zhang
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Ling
authors.forename: Xuliang
authors.initials: X
authors.lastname: Chen
authors.forename: Kejiang
authors.initials: K
authors.lastname: Li
authors.forename: Zhenghao
authors.initials: Z
authors.lastname: Deng
authors.forename: Jianhua
authors.initials: J
authors.lastname: Zhou
mesh_terms: D000368:Aged; D005260:Female; D015870:Gene Expression; D006801:Humans; D007150:Immunohistochemistry; D018971:Insulin-Like Growth Factor Binding Protein 2 / Q000235:genetics / Q000378:metabolism*; D008175:Lung Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009367:Neoplasm Staging; D012307:Risk Factors
chemical_list: D018971:Insulin-Like Growth Factor Binding Protein 2