Dormant cancer cells are characterized by increased p38 mitogen-activated protein kinase (p38 MAPK) and decreased extracellular signal-regulated kinase 1/2 (ERK1/2) activity; the p38 MAPKhigh/ERKlow phenotype is commonly used as a marker of dormancy (Recasens and Munoz, 2019). This evidence concerns the gene MAPK14 and cancer.