Therefore, a low expression level of Dicer may promote the progress ofmost tumors that are characterized by higher malignancy and poorer prognosis.However, the opposite conclusions have been reported in the study of colorectalcancer, bronchoalveolar carcinoma and lung adenocarcinoma, which suggests that thecarcinogenic mechanism of Dicer is tumor specific. This evidence concerns the gene DICER1 and lung adenocarcinoma.