Book excerpt: Cancer still poses a significant challenge in healthcare since traditional treatments often fail to produce desired results and patient outcomes. Conventional therapies, like chemotherapy and radiation, can have substantial side effects and may not always be able to eliminate cancer cells. Moreover, the heterogeneity of tumors and individual responses to treatment create barriers to achieving consistent and long-lasting outcomes. Critical Developments in Cancer Immunotherapy offers a compelling solution to these challenges by delving into the cutting-edge field of cancer immunotherapy. This book provides a comprehensive guide to the latest advancements in harnessing the body's immune system to fight cancer. Focusing on critical strategies like checkpoint inhibitors and CAR T-cell therapy, the book provides insights into novel approaches that offer greater precision and effectiveness in cancer treatment.