Used in immunotherapy research to significantly expand natural killer (NK) cell populations from human peripheral blood. This kit supports the generation of large numbers of highly active NK cells for adoptive cell therapy, particularly in cancer treatment. It is applied in clinical and preclinical studies to enhance NK cell cytotoxicity against tumor cells without the need for feeder cells. The expanded NK cells maintain a stable phenotype and show improved persistence and targeting ability, making them suitable for use in off-the-shelf allogeneic cell therapies. The kit is also utilized in studies aiming to improve immune responses in patients with solid tumors and hematological malignancies.