Lin28 promotes transformation and is associated with advanced human malignancies

George Daley and colleagues show that Lin28 and Lin28B promote cellular transformation by repressing let-7 family members, leading to derepression of let-7 targets. They also find that LIN28 and LIN28B are overexpressed in ∼15% of primary human tumors and cancer cell lines and that their expression is associated with aggressive disease and poor prognosis across multiple tumor types.