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Although a several varieties of nanoparticles is being explored to be used as nanomedicines, cerium oxide nanoparticles (CeO<jats:sub>2<\/jats:sub> NPs) are the most attractive due to their biocompatibility and their switchable oxidation state (+3 and +4) or in other words the ability to act as prooxidant and antioxidant depending on the pH condition. Green synthesis of nanoparticles is preferred to make it more economical, eco\u2010friendly, and less toxic. The aim of our study here is to formulate the CeO<jats:sub>2<\/jats:sub> NPs (CeO<jats:sub>2<\/jats:sub> NPs) using <jats:italic>Morinda citrifolia<\/jats:italic> (Noni) leaf extract and study its optical, structural, antibacterial, and anticancer abilities. Their optical and structural characterization was accomplished by employing X\u2010ray diffractography (XRD), TEM, EDAX, FTIR, UV\u2010vis, and photoluminescence assays. Our CeO<jats:sub>2<\/jats:sub> NPs expressed strong antibacterial effects against Gram\u2010positive <jats:italic>S. aureus<\/jats:italic> and <jats:italic>S. pneumonia<\/jats:italic> in addition to Gram\u2010negative <jats:italic>E. coli<\/jats:italic> and <jats:italic>K. pneumonia<\/jats:italic> when compared with amoxicillin. The anticancer properties of the green synthesized CeO<jats:sub>2<\/jats:sub> NPs against human acute lymphoblastic leukemia (ALL) MOLT\u20104\u2009cells were further explored by the meticulous study of their ability to diminish cancer cell viability (cytotoxicity), accelerate apoptosis, escalate intracellular reactive oxygen species (ROS) accumulation, decline the mitochondria membrane potential (MMP) level, modify the cell adhesion, and shoot up the activation of proapoptotic markers, caspase\u22123, \u22128, and \u22129, in the tumor cells. Altogether, the outcomes demonstrated that our green synthesized CeO<jats:sub>2<\/jats:sub> NPs are an excellent candidate for alternative cancer therapy.<\/jats:p>","DOI":"10.1155\/2022\/6835625","type":"journal-article","created":{"date-parts":[[2022,9,29]],"date-time":"2022-09-29T00:35:24Z","timestamp":1664411724000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["[Retracted] Structural, Optical, Antibacterial, and Anticancer Properties of Cerium Oxide Nanoparticles Prepared by Green Synthesis Using Morinda citrifolia Leaves Extract"],"prefix":"10.1155","volume":"2022","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6219-5312","authenticated-orcid":false,"given":"Abozer Y.","family":"Elderdery","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Badr","family":"Alzahrani","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdulrahim A.","family":"Alabdulsalam","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Siddiqa M. 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