Abdulkhaleq, FarahLarossi, NissOgbonda, OkandaAbu Eid, RashaWard, Frank2021-06-242021-06-242021-06-24Abdulkhaleq, F, Larossi, N, Ogbonda, O, Abu Eid, R & Ward, F 2021, 'CTLA-4 expression by human tumor cells and its impact on immunotherapeutic strategies : a systematic review', Immuno-Oncology Insights, vol. 2, no. 3, pp. 151-169. https://doi.org/10.18609/ioi.2021.024https://hdl.handle.net/2164/16735Contributions: Farah Abdulkhaleq, Niss Larossi and Okanda Ogbonda performed the search, screening and data extraction. Farah Abdulkhaleq, Rasha Abu-Eid and Frank James Ward wrote and edited the manuscript. Rasha Abu-Eid and Frank James Ward designed the study and checked the accuracy of data extraction. Acknowledgements: Farah Abdulkhaleq is supported by an Elphinstone Scholarship from the University of Aberdeen. Disclosure and potential conflicts of interest: The authors declare that they have no conflicts of interest. Funding declaration: The authors received no financial support for the research, authorship and/or publication of this article.19610616engSDG 3 - Good Health and Well-beingRK DentistryRKJournal item10.18609/ioi.2021.02423