Cancer is always a main factor threatening human’s health and life, and its incidence and mortality are gradually increasing in recent years. However, some advances have been made with the unremitting efforts and exploration human made and the improvement is mainly made in cancer treatment of young children and older adults, while little in adolescent and young adult (AYA) patients, who are generally defined as individuals of 15 to 39 years old at the time of initial cancer diagnosis due to many factors. To highlight the issues of this unique population, National Comprehensive Cancer Network (NCCN) absorbs a large amount of information and previous researches and develops a set of clinical practice guidelines. Though the guidelines are more supportive care guidelines than treatment guidelines, they give us the opportunity to learn the latest international developments in AYA treatment and more survival chance for the treatment of AYA patients.