JCO publishes original research, reviews, and other material related to breast cancer, gastrointestinal cancer, hematologic malignancies, molecular oncology, thoracic cancer, genitourinary cancer, head and neck cancer, pediatric oncology, neurooncology, supportive care and quality of life issues, prevention, and phase I and clinical pharmacology. Its readership comprises practicing clinical oncologists, researchers, students, individuals in training, and allied health professionals throughout the world. Members of the American Society of Clinical Oncology as well as nonmember subscribers and patrons of medical libraries globally utilize the groundbreaking research published in each issue of JCO. The Journal of Clinical Oncology (JCO) serves its readers as the single most credible, authoritative resource for disseminating significant clinical oncology research.