PIWIL1 and neoplasm: The expression level of HIWI in cytoplasm was significantly associated with histological grade (P = 0.011) and T stage (P = 0.035), but not associated with age, gender, tumour location, tumour size, lymph node metastasis and clinical stage, while there was no correlation between the expression level of HIWI in nucleus and the same clinicopathological features.