The intricate regulatory mechanisms governing TGF-β1 expression play pivotal roles in tumor progression. Key proteins such as FKBP1A, SMAD6, and SMAD7 trigger this process, modulating cell growth inhibition via p15INK4b and p21CIP1 induction. Despite TGF-β's tumor-suppressive functions, cancer cells adeptly evade its effects, fueling disease advancement. Tumor microenvironmental TGF-β1 prompts epithelial-mesenchymal transition (EMT), facilitated by transcription factors like slug, twist-1, and snail. Notably, cancer-associated fibroblasts (CAFs) amplify this effect by secreting TGF-β1, fostering drug resistance. Of particular concern is the resistance observed with BRAF/MEK inhibitors (BRAFi/MEKi), highlighting the clinical significance of TGF-β signaling in cancer therapeutics. However, emerging interest in natural anti-cancer agents, with their distinct pharmacological actions on signaling proteins offers promising avenues for therapeutic intervention. This review emphasizes the multifaceted interplay between TGF-β signaling, tumor microenvironment dynamics, and therapeutic resistance mechanisms, illuminating potential targets for combating cancer progression by natural bioactive compounds. However, this review additionally explores the currently available advanced methods for detecting various types of cancer. Not only that, but it also discussed the function of plant-derived compounds in clinical aspects, as well as its limitations.
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