Journal of clinical oncologyOfficial journal of the American Society of Clinical Oncology. 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.