CX3CL1 and neoplasm: This is important because it was previously thought that FKN expressed by tumors could exert anti‐tumor effects through the recruitment of T cells, DCs, and NK cells to the tumor microenvironment (Lavergne et al, 2003; Ohta et al, 2005; Xin et al, 2005; Tang et al, 2007; Hyakudomi et al, 2008; Park et al, 2012; Kee et al, 2013; Yamauchi et al, 2020, 2021).