Podoplanin is expressed in a variety of malignant cells, and is generally regarded as a factor promoting tumor progression in conventional studies. Conversely, a recent clinicopathological study has revealed that low podoplanin in cancer cells was correlated with poor prognosis of patients with stage IB lung squamous cell carcinoma (LSCC). We here evaluated the clinicopathological relationship between cancer-cell podoplanin expression and clinicopathological parameters in 40 cases of LSCC (stage I-III). Immunohistochemical podoplanin expression significantly correlated with N classification and pathological stage, but not with other clinicopathological parameters. Notably, all 16 cases with high podoplanin expression unexceptionally exhibited pathological N0 status. Cases without nodal metastasis showed a significantly higher podoplanin-positive score. Furthermore, patients with high podoplanin expression exhibited a significantly longer survival time and disease-free time. These findings suggest that immunohistochemical analysis for podoplanin may serve as a marker of risk of nodal metastasis and prognosis in patients with LSCC.
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