Introduction<br /><br />Cancer is one of the most significant health challenges facing humanity today, representing a leading cause of mortality worldwide. Despite remarkable advances in conventional treatments such as surgery, chemotherapy, and radiotherapy, many refractory cancers remain resistant to these therapies or relapse after treatment. In this context, gene therapy has emerged as one of the most promising modern approaches that could revolutionize the treatment of complex and hard-to-treat cancers.<br /><br />Concept of Gene Therapy<br /><br />Gene therapy refers to the introduction of new genes or the modification of existing genes in a patient’s cells to treat disease or enhance therapeutic response. It relies on advanced techniques such as:<br /><br />CRISPR-Cas9: for correcting cancer-causing mutations.<br /><br />Viral vectors: to deliver therapeutic genes into cancer cells.<br /><br />Suicide genes: inserted into tumor cells to make them more sensitive to drugs or to induce direct cell death.<br /><br />Mechanisms of Gene Therapy in Cancer<br /><br />Repairing genetic mutations: reprogramming cancer cells by correcting mutations responsible for uncontrolled growth.<br /><br />Enhancing immune response: introducing genes that activate the immune system to recognize and destroy cancer cells (e.g., CAR-T cell therapy).<br /><br />Inhibiting angiogenesis: targeting genes responsible for supplying tumors with blood vessels, thereby limiting their growth.<br /><br />Increasing tumor sensitivity: making cancer cells more responsive to chemotherapy or radiotherapy by introducing supportive genes.<br /><br />Recent Applications<br /><br />CAR-T Therapy: one of the most successful applications of gene therapy in treating acute lymphoblastic leukemia (ALL) and lymphomas.<br /><br />Genetic immunotherapy: introducing genes that produce immune proteins (cytokines) to attack tumors.<br /><br />Targeted gene therapies: focusing on specific mutations such as p53 or BRCA1/2.<br /><br />Challenges<br /><br />Despite promising outcomes, gene therapy still faces several obstacles, including:<br /><br />The difficulty of precisely delivering therapeutic genes to target cells.<br /><br />Potential side effects, such as triggering unwanted immune responses.<br /><br />The high cost of modern gene-editing technologies.<br /><br />Ethical concerns, especially regarding genetic modification in somatic versus germline cells.<br /><br />Conclusion<br /><br />Gene therapy represents a groundbreaking and promising strategy in the treatment of refractory cancers, offering opportunities that go beyond traditional therapies by targeting the genetic roots of the disease and enhancing the body’s natural defense mechanisms. Although scientific, practical, and ethical challenges remain, the future holds great potential for safer and more effective gene therapies—possibly transforming cancer into a manageable or even curable disease.<br />AL_mustaqbal University is the first university in Iraq