The data are supported by findings of other authors such as Satoh et al [35] reported that PPM1D was a prognostic marker in lung adenocarcinoma patients and Castellino et al [36, 37] showed that high PPM1D expression was correlated with poor prognosis in patients with pancreatic neuroendocrine tumors and medulloblastoma. Here, PPM1D is linked to pancreatic neuroendocrine tumor.