7 Background: It is proven that the online documentation and transmission of symptoms can prolong the overall survival of cancer patients. Recent studies have shown that this advantage exists both in conventional chemotherapy and in oral therapy.Current implementations require a healthcare professional who monitors the data online. In most centers, such kind of human resources is not available except in clinical trials. It was therefore the goal of this project to develop an eHealth procedure, in which no permanent online observation is necessary. Methods: PRO-React, a symptom-based automated feedback or advice feature is integrated into the eHealth platform CANKADO. In the online settings, physician activates medication plans for his patients, documents drug-taking and sets reminders for the patient of future intake times. PRO-React assists the patients daily in global health documentation and dynamic symptom questionnaires. A built-in automated analysis brings forth suitable recommendations for patients like discuss with the physician, visit the physician immediately, visit directly or go to ER. The patient reported outcomes are shared in real-time with the physicians. Results: Trials are ongoing. Interim analysis is planed for January 2018. Results will be presented at the conference. Conclusions: PRO-React helps in the dynamic recognition of events with minimal daily documentation from the patients as well as assist in reacting to the needs of the patients. It also circumvents the need of a mediator group like nurses and thereby increase compliance and improve the doctor-patient-relationship leading to decreased mortality and higher patient satisfaction. PRO-React is available for routine care but also included into several multi-center trials.