Tumor regression refers to the reduction or disappearance of a tumor in response to a specific treatment or intervention. This area of research focuses on understanding the mechanisms by which tumors shrink or disappear, and developing effective strategies to induce tumor regression in cancer patients. This may involve studying the molecular pathways involved in tumor growth and survival, identifying novel therapeutic targets, and evaluating the efficacy of various treatment approaches, such as chemotherapy, radiation therapy, immunotherapy, or targeted therapies. Tumor regression research aims to improve cancer treatment outcomes and ultimately improve the survival and quality of life for patients with cancer.