Thermo Fisher Scientific announced the launch of Gibco Cell Therapy Systems (CTS) NK-Xpander Medium, a GMP-manufactured cell culture medium that supports large-scale growth and culture of functional natural killer (NK) cells with or without the use of feeder cells. This is the first medium from Thermo Fisher specifically designed to support expansion of NK cells for cell therapy applications and is supported by raw material traceability and regulatory documentation. NK cells grown in NK-Xpander Medium exhibit a greater rate of expansion when compared to NK cells grown in other media and demonstrate cell killing in vitro and in vivo models. In addition to their low immunogenicity, the ease of availability and sourcing of NK cells, coupled with efficient in vitro expansion, make them ideally suited for the development of allogeneic cell therapies. Unlike autologous therapies, which are produced using a patient's own cells, allogeneic cell therapies are derived from healthy donor tissue, and are more conducive to cost-effective scale-up of cell therapy manufacturing. NK-Xpander Medium is part of Thermo Fisher's CTS product line, a comprehensive portfolio of GMP-manufactured products backed by regulatory documentation and designed to work synergistically, from cell isolation/activation to gene transfer and cell expansion, to address cell therapy developers' manufacturing workflow needs.