UCA1 and neoplasm: Five studies analyzed the involvement of UCA1 in tamoxifen resistance, and found that the luminal-A-type LCC2 and LCC9—tamoxifen-resistant cells—as well as BT474 cells expressed significantly higher UCA1 levels compared to the MCF7 controls, whereas the UCA1 inhibition resulted in enhanced sensitivity to tamoxifen, decreased cell viability, and deceleration of tumor growth [3,23,48,49,50].