The anti-cancer effects of quercetin have been investigated in many studies and the role of that in preventing the growth, proliferation and progression of cancer through cellular signalling pathways such as Wnt/β-catenin signalling, phosphoinositide 3-kinase (PI3K)/protein kinase B (AKT) pathway, Janus kinase (JAK)/signal transducer and transcription activator (STAT) signalling pathway, mitogen-activated protein kinase (MAPK) pathway, p53 signalling and nuclear factor kappa B (NF-κB) pathway [23]. The gene discussed is TP53; the disease is cancer.