[Current Status and Challenges of Cancer Survivorship Researchs in Japan].

Cancer patients have been able to live longer according to the development of early diagnosis and treatment. On the other hand, prolonged treatment period, increased cost burdens, and various late complications can occur as a result. In this article, I introduce research on cancer survivorship in Japan, about the statistics for cancer survivors, physical, mental, and social late complications. I also summarize the issues of survivorship research that should be conducted in Japan in the future. First, the 5-year survival has been used as a prognostic indicator for cancer survivors, however, the conditional survival, which is more useful information to predict the patients' future, was introduced. In addition, studies on late complications of cancer patients were summarized, including studies on the development of secondary cancer as a physical complication, suicide as a psychological complication, and continued employment and economic toxicity as social complications. Finally, we summarized the research and data bases that are needed to realize"cancer control that leaves no one behind".