BACKGROUND: Whether Smad7 acts as a tumor proliferation promoting factor or as a metastatic suppressor in human pancreatic cancer remains unclear. This study aims to determine the prognostic value of Smad7 in patients with pancreatic adenocarcinoma. METHODS: Surgical specimens obtained from 71 patients with pancreatic adenocarcinoma were immunohistochemically assessed for Smad7, Ki-67, MMP2, CD34, and Smad4 expression. The relationship between Smad7 expression and the clinicopathological characteristics of patients with pancreatic adenocarcinoma were also evaluated. RESULTS: Fifty-one of 71 specimens (71.8%) were Smad7 positive and 20 specimens were Smad7 negative. Negative expression of Smad7 correlated with lymph node metastasis, liver metastasis after surgery, and a poor survival rate (P = 0.0004, 0.0044, and 0.0003, respectively). We also found an inverse correlation between the expression of Smad7 and MMP2 (P = 0.0189). Multivariate analysis revealed that Smad7 expression was an independent prognostic factor [hazard ratio (HR) 0.3902; 95% confidence interval (CI) 0.1839-0.8277; P = 0.0142]. Furthermore, in both Smad4-negative and Smad4-positive groups, survival of patients with Smad7-positive tumors was significantly better than those with Smad7-negative tumors (both P < 0.0001). CONCLUSIONS: We conclude that low-level expression of Smad7 in pancreatic cancer is significantly associated with lymph node metastasis, high MMP2 expression, and poor prognosis.
BACKGROUND: Whether Smad7 acts as a tumor proliferation promoting factor or as a metastatic suppressor in humanpancreatic cancer remains unclear. This study aims to determine the prognostic value of Smad7 in patients with pancreatic adenocarcinoma. METHODS: Surgical specimens obtained from 71 patients with pancreatic adenocarcinoma were immunohistochemically assessed for Smad7, Ki-67, MMP2, CD34, and Smad4 expression. The relationship between Smad7 expression and the clinicopathological characteristics of patients with pancreatic adenocarcinoma were also evaluated. RESULTS: Fifty-one of 71 specimens (71.8%) were Smad7 positive and 20 specimens were Smad7 negative. Negative expression of Smad7 correlated with lymph node metastasis, liver metastasis after surgery, and a poor survival rate (P = 0.0004, 0.0044, and 0.0003, respectively). We also found an inverse correlation between the expression of Smad7 and MMP2 (P = 0.0189). Multivariate analysis revealed that Smad7 expression was an independent prognostic factor [hazard ratio (HR) 0.3902; 95% confidence interval (CI) 0.1839-0.8277; P = 0.0142]. Furthermore, in both Smad4-negative and Smad4-positive groups, survival of patients with Smad7-positive tumors was significantly better than those with Smad7-negative tumors (both P < 0.0001). CONCLUSIONS: We conclude that low-level expression of Smad7 in pancreatic cancer is significantly associated with lymph node metastasis, high MMP2 expression, and poor prognosis.
Authors: Scott K Sherman; Jessica E Maxwell; Qining Qian; Andrew M Bellizzi; Terry A Braun; Mark D Iannettoni; Benjamin W Darbro; James R Howe Journal: Cancer Genet Date: 2014-11-15
Authors: Cindy Neuzillet; Armand de Gramont; Annemilaï Tijeras-Raballand; Louis de Mestier; Jérome Cros; Sandrine Faivre; Eric Raymond Journal: Oncotarget Date: 2014-01-15