Pleiotrophin Expression in Human Pancreatic Cancer and Its Correlation with Clinicopathological Features, Perineural Invasion, and Prognosis

Pleiotrophin (PTN), a heparin-binding growth factor also known as neurite growth-promoting factor, exhibits several properties related with tumor development. PTN and its receptor, N-syndecan, may play a very important role in tumor growth and neural invasion of pancreatic cancer. We investigated PTN and N-syndecan protein levels in 38 patients with pancreatic cancer by immunohistochemistry, and analyzed for its correlation with clinicopathological features, perineural invasion, and prognosis. The results showed that PTN and N-syndecan proteins were found in 24 (63.2%) and 22 (57.9%) specimens, respectively. PTN and N-syndecan expressions were associated with perineural invasion (P = 0.016 and P = 0.029, respectively). High PTN expression was closely related to an advanced TNM stage (P = 0.007), lymph node metastasis (P = 0.040), and decreased postoperative survival at 3 years (50.0% versus 20.8%, respectively; P = 0.001). We conclude that high expression of PTN combined with N-syndecan may contribute to the increased perineural invasion and poor prognosis of pancreatic cancer.