“…The cytokines are the first to use the direct engagement of NKR to boost the immune response of NK cells for treating cancer disease. These include IL2, IL12, IL15, IL21, and type I IFNs but not for all [ 176 , 177 , 178 , 179 , 180 , 181 , 182 ]. Following cytokine treatment, NK cells convert (turn into) lymphokine-activated killer (LAK) cells, subsequently producing cytokines and upregulating the factors such as adhesion molecules, perforin, granzymes, FasL, and TRAIL [ 183 , 184 , 185 , 186 , 187 ], thereby enhancing their capability to detect and adhere to cancer cells, triggering various activity to eliminate cancer cells through perforin/granzyme-dependent necrosis [ 188 , 189 ] and/or Fasl/TRAIL-mediated apoptosis [ 184 , 185 , 186 , 187 ].…”