Expression of Tiam1 predicts lymph node metastasis and poor survival of lung adenocarcinoma patients

Abstract

Background: To assess the value of Tiam1 in predicting lymph node metastasis and survival after curative resection in patients with lung adenocarcinoma.

Methods: Immunohistochemical staining for Tiam1 was performed on 98 adenocarcinoma and 30 normal lung tissues. The association of Tiam1 protein expression with the clinicopathological characteristics and the prognosis of lung adenocarcinoma were subsequently assessed.

Results: Immunohistochemical analysis showed that 60 of 98 (61.22%) adenocarcinoma tissues showed high expression of Tiam1, and high Tiam1 expression was significantly associated with advanced TNM stage (P < 0.0005) and lymph node status (P < 0.0005) of lung adenocarcinoma. Moreover, the lung adenocarcinoma patients with low Tiam1 expression had higher overall survival than patients with high Tiam1 expression (log rank value = 10.805, P = 0.001). High expression of Tiam1 predicted poor overall survival of patients in stages I + II (P = 0.006). Furthermore, multivariate analysis indicated that high expression of Tiam1 protein was an independent prognostic factor for overall survival (P = 0.011) in patients with lung adenocarcinoma.

Conclusion: These findings suggest for the first time that Tiam1 expression may be beneficial in predicting lymph node metastasis and survival of patients with lung adenocarcinoma. A future study will investigate whether Tiam1 can serve as a novel therapeutic target in lung adenocarcinoma.

Virtual slides: The virtual slide(s) for this article can be found here: http://www.diagnosticpathology.diagnomx.eu/vs/1377798917111123.

Figure 1

Expression of Tiam1 in lung adenocarcinoma and normal lung tissue. A Negative expression in normal lung tissue; B Mild expression in lung adenocarcinoma tissue; C Moderate expression in lung adenocarcinoma tissue; D Strong expression in lung adenocarcinoma tissue.

Figure 2

Kaplan–Meier curves of overall survival defined by Tiam1 expression. Patients with low Tiam1 expression had higher overall survival than patients with high Tiam1 expression (P = 0.001, log rank test).

Figure 3

Association of Tiam1 expression with overall survival of patients with lung adenocarcinoma in different stages. High expression of Tiam1 predicted poor overall survival in stages I + II (P = 0.006) but not stages III + IV (P = 0.441) patients (Figure 3A, B).