Phytochemicals as Novel Therapeutics for Triple‐Negative Breast Cancer: A Comprehensive Review of Current Knowledge

ABSTRACT Triple‐negative breast cancer is a characteristic subtype of breast cancer that lacks the estrogen receptor, human epidermal growth factor receptor 2, and progesterone receptor. Because of its highly diverse subtypes, increased metastasis capability, and poor prognosis, the risk of mortality for people with triple‐negative breast cancers is high as compared with other cancers. Chemotherapy is currently playing a major role in treating triple‐negative breast cancer patients; however, poor prognosis due to drug resistance is causing serious concern. Recent studies on several phytochemicals derived from various plants being used in Traditional Chinese Medicine, Traditional Korean Medicine, Ayurveda (Traditional Indian Medicine), and so on, have demonstrated to be a promising agent as a viable therapy against triple‐negative breast cancer. Phytochemicals categorized as alkaloids, polyphenols, terpenoids, phytosterols, and organosulfur compounds have been demonstrated to reduce cancer cell proliferation and metastasis by activating various molecular pathways, thereby reducing the spread of triple‐negative breast cancer. This review analyzes the molecular mechanisms by which various phytochemicals fight triple‐negative breast cancer and offers a perspective on the difficulties and potential prospects for treating triple‐negative breast cancer with various phytochemicals.