The UPR is executed by three ER stress sensors‐ inositol‐requiring enzyme 1 (IRE1), activating transcription factor 6 (ATF6), and RNA‐dependent protein kinase (PKR)‐like ER kinase (PERK) and all these ER stress sensors are activated by quercetin in ovarian cancer 77. This evidence concerns the gene ERN1 and ovarian cancer.