Combination therapies have become a crucial approach in cancer treatment, focusing on improving effectiveness while addressing issues like drug resistance and the diversity of tumors. This chapter offers a thorough overview of the principles, mechanisms, and clinical uses of combination therapies in oncology. It starts with a historical perspective, tracing the development of cancer treatments and emphasizing the need for combinations to enhance patient outcomes. The mechanisms of synergy—such as targeting various oncogenic pathways, adjusting the immune response, and altering the tumor microenvironment—are examined in detail, showing how these strategies can enhance therapeutic results. Important combinations, including chemotherapy paired with targeted therapies and immunotherapy, are discussed, highlighting their synergistic potential as demonstrated in recent clinical trials across different cancers, such as breast, lung, and colorectal cancers. Furthermore, the chapter explores the role of precision medicine in selecting effective combinations based on individual genetic profiles and tumor characteristics. Challenges like increased toxicity, complex dosing, and drug-drug interactions are critically assessed, along with strategies for optimizing combinations, including adaptive trial designs and the use of artificial intelligence. Lastly, we look at future directions, emphasizing the significance of new drug classes, nanomedicine, and gene-editing technologies in advancing combination therapies. This chapter highlights the transformative potential of synergistic treatments in achieving more effective, personalized, and adaptive cancer therapies, paving the way for better patient care and outcomes in oncology.
Keywords: Artificial intelligence, Chemotherapy, Clinical trials, Combination therapy, Drug resistance, Immunotherapy, Synergy, Targeted therapy, Tumor heterogeneity.
