OBJECTIVE: Tyrosine kinase B (TrkB) is associated with aggressive behavior and poor prognosis in various cancers. Here we examined the association between TrkB expression and distant metastases/prognosis in gastric carcinoma (GC). PATIENTS AND METHODS: We analyzed TrkB expression in 161 GC patients by immunohistochemistry and Western blot analysis. The correlation of TrkB mRNA and protein expression levels was examined in 10 patients by RT-PCR assay. RESULTS: TrkB expression was of level 1 in 97 (60.2%) and level 2 in 64 (39.8%) patients. Patients with level 2 expression had a significantly higher incidence of distant metastases (p < 0.0001), well-differentiated tumors (p < 0.005), deeper depth of invasion (p < 0.005) and poorer disease-free and overall survival (p < 0.0001 each) compared to patients with level 1. Multivariate analysis identified the level of TrkB expression as an independent prognostic factor for both disease-free and overall survival (p < 0.01 and p < 0.0001, respectively). Both lymph node metastasis (odds ratio = 10.7) and TrkB expression (odds ratio = 9.3) were independent predictors of distant metastases. CONCLUSION: A high level of TrkB expression was observed in well-differentiated GC subtypes and is a predictor for distant metastases and prognosis in GC. Copyright 2008 S. Karger AG, Basel.
OBJECTIVE:Tyrosine kinase B (TrkB) is associated with aggressive behavior and poor prognosis in various cancers. Here we examined the association between TrkB expression and distant metastases/prognosis in gastric carcinoma (GC). PATIENTS AND METHODS: We analyzed TrkB expression in 161 GC patients by immunohistochemistry and Western blot analysis. The correlation of TrkB mRNA and protein expression levels was examined in 10 patients by RT-PCR assay. RESULTS:TrkB expression was of level 1 in 97 (60.2%) and level 2 in 64 (39.8%) patients. Patients with level 2 expression had a significantly higher incidence of distant metastases (p < 0.0001), well-differentiated tumors (p < 0.005), deeper depth of invasion (p < 0.005) and poorer disease-free and overall survival (p < 0.0001 each) compared to patients with level 1. Multivariate analysis identified the level of TrkB expression as an independent prognostic factor for both disease-free and overall survival (p < 0.01 and p < 0.0001, respectively). Both lymph node metastasis (odds ratio = 10.7) and TrkB expression (odds ratio = 9.3) were independent predictors of distant metastases. CONCLUSION: A high level of TrkB expression was observed in well-differentiated GC subtypes and is a predictor for distant metastases and prognosis in GC. Copyright 2008 S. Karger AG, Basel.
Authors: A Kamiya; M Inokuchi; S Otsuki; H Sugita; K Kato; H Uetake; K Sugihara; Y Takagi; K Kojima Journal: Clin Transl Oncol Date: 2015-10-12 Impact factor: 3.405