Meanwhile, Park et al. demonstrated that chrysophanol activates proapoptotic proteins and increases intracellular Ca2+ levels, ROS generation, and ER stress by upregulating UPR proteins (PERK, eIF2α, GADD153, and IRE1α) to induce selective antiproliferative effects and apoptosis in breast cancer cells [30]. The gene discussed is EIF2A; the disease is breast carcinoma.