title: Combined detection of Gab1 and Gab2 expression predicts clinical outcome of patients with glioma.
abstract: Grb2-associated binder 1 (Gab1) and Gab2 play important roles in cancer cell signaling. In particular, it has been demonstrated that the upregulation of Gab2 may be correlated with the World Health Organization (WHO) grade of gliomas and that patients with high Gab2 expression levels exhibited shorter survival time. However, the prognostic value of combined expression of Gab1 and Gab2 has not been explored. Gab1 and Gab2 expression in human gliomas and non-neoplastic brain tissues was measured by immunohistochemistry. Both the expression levels of Gab1 and Gab2 proteins in glioma tissues were significantly higher than those in non-neoplastic brain tissues (both P < 0.001). In addition, the overexpression of Gab1 and Gab2 proteins were both significantly associated with advanced WHO grades (both P < 0.001) and low KPS (both P = 0.01). Moreover, the overall survival of patients with high Gab1 protein expression or high Gab2 protein expression was obviously lower than those with low expressions (both P < 0.001). Notably, glioma patients with combined overexpression of Gab1 and Gab2 proteins (Gab1-high/Gab2-high) had shortest overall survival (P < 0.001). Furthermore, multivariate analysis showed that Gab1 expression (P = 0.01), Gab2 expression (P = 0.02), and combined expression of Gab1 and Gab2 (Gab1/Gab2, P = 0.006) were all independent prognostic factors for overall survival in glioma patients. Gab1 and Gab2 proteins are differentially expressed in glioma patients and closely correlated with the biological behavior of this malignancy. Combination of Gab1 and Gab2 expression may represent a promising biomarker for prognostication of human gliomas.
authors.affiliation: Department of Experimental Surgery, Tangdu Hospital, Fourth Military Medical University, Xi'an, 710038, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.forename: Weitao
authors.initials: W
authors.lastname: Zeng
authors.forename: Pengxing
authors.initials: P
authors.lastname: Zhang
authors.forename: Feiyan
authors.initials: F
authors.lastname: Fan
authors.forename: Yanyang
authors.initials: Y
authors.lastname: Tu
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000032:analysis / Q000378:metabolism*; D000293:Adolescent; D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism; D001932:Brain Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology / Q000628:therapy*; D002648:Child; D005260:Female; D005910:Glioma / Q000378:metabolism* / Q000401:mortality / Q000473:pathology / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D016016:Proportional Hazards Models; D015996:Survival Rate; D016896:Treatment Outcome; D015854:Up-Regulation; D055815:Young Adult
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D014408:Biomarkers, Tumor; C098587:GAB1 protein, human; C490895:GAB2 protein, human