PLPP4 and lung carcinoma: Statistical analysis of PLPP4 expression and the clinicopathological features of lung carcinoma patients showed that PLPP4 expression positively correlated with the pathological grade, T category and stage of lung carcinoma and the percentage of tissues with high expression of PLPP4 increased gradually with the advance of pathological grade, T category and stage of lung carcinoma (Fig. 2d-g and Additional file 7: Table S7).