STAT3 and cancer: Recently, emerging evidence has revealed that CaMKIIγ, a multifunctional serine/threonine kinase, plays a critical role in maintaining the stem-like features of cancer cells by acting as a molecular switch that regulates several cancer stemness-related signaling pathways, such as NF-κB, Wnt/β-catenin, Notch, and STAT3 [35,36,37].