{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,9]],"date-time":"2026-10-09T23:22:26Z","timestamp":1791588146485,"version":"4.3.4"},"reference-count":338,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2026,7,15]],"date-time":"2026-07-15T00:00:00Z","timestamp":1784073600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Nutrients"],"abstract":"<jats:p>Cancer development arises from dynamic interactions between inherited susceptibility and modifiable environmental exposures, among which diet plays a central role. Carotenoids, lipophilic plant-derived pigments including lycopene, \u03b1-carotene, and \u03b2-carotene, and retinoids, the vitamin A derivatives that regulate gene transcription via retinoic acid receptors (RARs) and retinoid X receptors (RXRs), have been extensively investigated for their chemopreventive and therapeutic potential. This review aims to provide an integrated, mechanism-based synthesis of the roles of lycopene, \u03b1- and \u03b2-carotene, and retinoids in cancer chemoprevention and to clarify the conditions under which they are most likely to be effective. Beyond summarizing established antioxidant and nuclear-receptor mechanisms, we highlight as a novel emphasis the epigenetic actions of these compounds, including effects on DNA methylation, histone modification, and microRNA regulation, and we integrate these with the well-recognized divergence between dietary and high-dose supplement outcomes. Experimental evidence demonstrates that carotenoids modulate oxidative stress, inflammation, proliferation, apoptosis, angiogenesis, and metastasis through pathways such as Nrf2\/ARE, NF-\u03baB, STAT3, Akt\/mTOR, MAPK, and Wnt\/\u03b2-catenin. Lycopene, in particular, exhibits strong antioxidant capacity and multi-target signaling effects, while provitamin A carotenoids additionally influence retinoid-mediated transcriptional programs. Retinoids exert broader differentiation-inducing and antiproliferative effects through direct nuclear receptor signaling and represent one of the few successful differentiation therapies in oncology, most notably in acute promyelocytic leukemia. Epidemiologic studies generally associate higher dietary carotenoid intake with reduced risk of several malignancies, including prostate, breast, lung, colorectal, and gastric cancers. However, randomized trials of isolated high-dose supplementation, particularly \u03b2-carotene in smokers, have demonstrated null or harmful effects, highlighting a critical divergence between whole-food dietary patterns and pharmacologic supplementation. In conclusion, carotenoids and retinoids possess biologically plausible anticancer properties, yet their clinical utility remains context dependent. Future research should prioritize biomarker-guided, precision-based strategies, standardized formulations, and whole-food dietary approaches to clarify their role in cancer prevention and treatment.<\/jats:p>","DOI":"10.3390\/nu18142318","type":"journal-article","created":{"date-parts":[[2026,7,16]],"date-time":"2026-07-16T01:05:07Z","timestamp":1784163907000},"page":"2318","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Lycopene, Carotenoids, and Retinoids in Cancer Chemoprevention: Molecular Mechanisms and Clinical Implications"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6312-0048","authenticated-orcid":false,"given":"Ecem","family":"Kalemoglu","sequence":"first","affiliation":[{"name":"Department of Medicine, Rutgers University-Jersey City Medical Center, Jersey City, NJ 07302, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9542-5244","authenticated-orcid":false,"given":"Kazim","family":"Sahin","sequence":"additional","affiliation":[{"name":"Department of Animal Nutrition, Faculty of Veterinary Science, Firat University, 23119 Elazig, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9487-1154","authenticated-orcid":false,"given":"Nurhan","family":"Sahin","sequence":"additional","affiliation":[{"name":"Department of Animal Nutrition, Faculty of Veterinary Science, Firat University, 23119 Elazig, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4755-0507","authenticated-orcid":false,"given":"Omer","family":"Kucuk","sequence":"additional","affiliation":[{"name":"Winship Cancer Institute of Emory University, Atlanta, GA 30322, USA"},{"name":"Department of Urology, Emory University School of Medicine, Atlanta, GA 30322, USA"},{"name":"Department of Hematology and Medical Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"104830","DOI":"10.1016\/j.phrs.2020.104830","article-title":"Dietary carotenoids in cancer chemoprevention and chemotherapy: A review of emerging evidence","volume":"157","author":"Saini","year":"2020","journal-title":"Pharmacol. 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