Plant-Derived Bioactive Compounds in Inflammation-Related Cancers: Mechanisms and Therapeutic Potential

Chronic inflammation is a well-established driving force in tumor initiation and progression, accounting for a substantial proportion of inflammation-associated malignancies. Persistent inflammatory stimulation creates a pathological microenvironment characterized by sustained inflammatory signaling, oxidative stress, immune dysregulation, and epigenetic reprogramming, which collectively promote genomic instability, malignant transformation, and tumor progression. Understanding the biological basis of inflammation-cancer transformation is therefore essential for the development of effective preventive and therapeutic strategies. Plant-derived bioactive compounds have attracted increasing attention as promising modulators of inflammation-driven carcinogenesis due to their structural diversity, multi-target regulatory capacity, and relatively low toxicity. Specifically, this review focuses on four major classes of these compounds: flavonoids, alkaloids, terpenoids, and curcuminoids. Accumulating evidence demonstrates that these compounds can effectively interrupt the inflammation-cancer continuum by simultaneously targeting multiple pathogenic processes rather than single molecular pathways. In particular, these plant-derived agents suppress inflammation-driven signaling cascades, including NF-κB, MAPK, and JAK/STAT pathways; attenuate oxidative stress and inflammation-induced DNA damage; reprogram the immune microenvironment to restore anti-tumor immunity; and modulate epigenetic and transcriptional programs that stabilize pro-tumorigenic phenotypes. Accordingly, this review synthesizes the shared pathological drivers of inflammation-cancer transformation and summarizes how plant-derived compounds collectively target these mechanisms to interrupt disease progression. In addition, emerging translational strategies, including combination therapy and nanocarrier-based delivery systems, are discussed to highlight the clinical potential of plant-derived interventions. Collectively, this review offers an integrated mechanistic framework for understanding and exploiting plant-derived bioactive compounds in the prevention and treatment of inflammation-related cancers.