CASP3 and breast cancer: Bala et al. [122] selected two glutathione-binding RNA aptamers with respective Kd values of 41.8 and 48.9 nM, which could induce apoptosis of MCF-7 breast cancer cells through the accumulation of reactive oxygen species (ROS) and modulation of intracellular glutathione and caspase-3 activation, suggesting that glutathione-binding RNA aptamers could be developed into effective therapeutic agents for breast cancer treatment.