Protein kinases play important roles in regulating cellular functions, including proliferation, survival, apoptosis, motility as well as metabolism and DNA damage repair, etc. Protein kinases such as cellular Src (c-Src), c-Abl, mitogen activated protein kinase (MAPK), phosphotidylinositol-3- kinase (PI3K), serine/threonine -specific protein kinase (AKT) and the epidermal growth factor receptor (EGFR), are commonly activated in cancer cells and known to play roles in tumorigenesis. The gene discussed is WEE1; the disease is cancer.