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Background aims Natural killer (NK) cells are promising cells for immunotherapy of cancer, and there are ongoing efforts to improve their ex vivo expansion to clinically relevant numbers. This study focused on the development of a C1-, C2-, Bw4 killer cell immunoglobulin-like receptor (KIR) ligand and NKG2A ligand-containing feeder cell line for autonomous expansion of functional NK cells. Methods PC3PSCA-derived feeder cells expressing IL-2, 4-1BBL and membrane-bound IL-15-mutDAP12 (mIL-15d) fusion protein in combinations or alone were g