© The Author(s) 2023. Published by Oxford University Press on behalf of the British Society for Immunology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. Peripheral blood persistence and expansion of transferred non-genetically modified Natural Killer cells might not be necessary for clinical activity. Lucia Silla, MD, PhD Universidade Federal do Rio Grande do Sul – Hospital de Clinicas de Porto Alegre Correspondence: Lucia Silla, Rua Ramiro Barcelos #2350, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil 90035-903. E-mail: dralucia.silla@gmail.com Downloaded from https://academic.oup.com/immunotherapyadv/advance-article/doi/10.1093/immadv/ltac024/6986824 by guest on 15 January 2023