Synergistic potential of medicinal plant–derived phytochemicals and nanotechnology-based delivery systems in modern cancer therapy

Cancer remains a major global health challenge due to its molecular complexity, heterogeneity, and frequent resistance to conventional therapies. Although chemotherapy, radiotherapy, and immunotherapy remain central to cancer management, their clinical effectiveness is often limited by toxicity, poor selectivity, and drug resistance. In this context, medicinal plants and their bioactive phytochemicals have gained increasing attention as complementary and alternative strategies owing to their multi-targeted anticancer properties and favorable safety profiles. This review comprehensively explores the synergistic potential of plant-derived compounds—including flavonoids, alkaloids, terpenoids, phenolics, and saponins—in cancer prevention and therapy, with particular emphasis on their ability to modulate key molecular pathways involved in apoptosis, proliferation, angiogenesis, metastasis, inflammation, oxidative stress, and epigenetic regulation. The manuscript further highlights the advantages of combinational phytotherapy, wherein natural compounds are used alone or in conjunction with conventional anticancer agents to enhance therapeutic efficacy, overcome drug resistance, and reduce treatment-related toxicity. Importantly, recent advances in nanotechnology-based drug delivery systems are discussed as a transformative approach to address the major pharmacokinetic limitations of phytochemicals, such as poor solubility, low bioavailability, and rapid metabolism. Nanoparticle formulations—including polymeric nanoparticles, liposomes, nanoemulsions, micelles, and carrier-free self-assembled systems—have demonstrated improved stability, controlled release, tumor-targeted delivery, and enhanced anticancer outcomes across multiple cancer types. Collectively, this review underscores the integration of medicinal plant–derived bioactives with advanced nanotechnology platforms as a promising, sustainable, and multi-targeted strategy for modern cancer therapy. Such approaches bridge traditional medicine with contemporary biomedical innovation and offer new directions for the development of safer, more effective, and personalized anticancer interventions.