IDH1 expression level in tumor tissues was negatively correlated with tumor Fuhrman grade (p = 0.025), whereas other patients’ clinicopathological features, including gender, age, TNM stage, T stage, N stage, M stage, tumor size, necrosis and SSIGN score, were not correlated with IDH1 expression (p > 0.05). The gene discussed is IDH1; the disease is neoplasm.