[E-health and "Cancer outside the hospital walls", Big Data and artificial intelligence].

To heal otherwise in oncology has become an imperative of Public Health and an economic imperative in France. Patients can therefore receive live most of their care outside of hospital with more ambulatory care. This ambulatory shift will benefit from the digital revolution and the development of digital health or e-health. Cancer research will also benefit with Big Data and artificial intelligence, which gather and analyze a huge amount of data. In this synthesis, we describe the different e-health tools and their potential impacts in oncology, at the levels of education and information of patients and caregivers, prevention, screening and diagnosis, treatment, follow-up, and research. A few randomized studies have already demonstrated clinical benefits. Large Big Data projects such as ConSoRe and Health Data Hub have been launched in France. We also discuss the issues and limitations of "cancer outside the hospital walls and e-health" from the point of view of patients, health care professionals, health facilities and government. This new organization will have to provide remote support "outside the walls" with care and follow-up of quality, continuous and prolonged in total safety and equity. Ongoing and future randomized clinical trials will need to definitively demonstrate areas of interest, advantages and drawbacks not only for patients, but also for caregivers, health facilities and governments.