Reduced Dicer mRNA in cancers of the breast [14]–[16], [51]–[53], lung [54], [55] and ovary [56] was associated with aggressive phenotypic features, whereas the converse is described in prostatic [41], ovarian [42], [57], oesophageal [58] and colorectal [44] cancers by others. This evidence concerns the gene DICER1 and breast cancer.