ollow-up is the medical care of patients once their treatment has been completed. The goals of followup include providing psychosocial support in the reintegration of patients into family and professional life, as well as detecting relapses and complications that may be due to their disease or treatment. Is is assumed that early recognition of disorders is beneficial.All patients that are able to participate in rehabilitation following their treatment should be offered rehabilitative measures. The intervals of subsequent follow-up are shorter in the first years compared to those later, since prompt psychosocial support is required and recurrence is generally rapid. Possible follow-up measures include patient history, physical examination, laboratory tests, instrument-based methods, and referrals to other medical specialties (1). Who provides which services and when in order to achieve follow-up goals in an optimal manner has been systematically investigated in only very few cases. Current follow-up plans are largely based on clinical experience and expert consensus.Evidence is defined as the state of knowledge on which the recommendation for a medical intervention is based. A number of scales that overlap in essential features are used to classify evidence (2). The highest level of evidence is obtained from prospective randomized studies, followed by retrospective investigations, case reports, and expert opinions. Based on the available evidence, a number of institutions in Germany have formulated recommendations on the follow-up care of cancer patients. These range from the short Onkopedia guidelines issued by the German Society for Hematology and Medical Oncology (Deutsche Gesellschaft für Hämatologie und Medizinische Onkologie, DGHO) (3) to the comprehensive S3 guidelines of the Association of the Scientific Medical Societies in Germany (Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften, AWMF), in the formulation of which numerous disciplines have participated according to strictly defined rules (4). National and international guidelines (e.g., the European Society for Medical Oncology and the US National Comprehensive Cancer Network) concur in many, but not all, aspects of follow-up design.This article presents the recommendations on and scientific bases for follow-up care in colorectal cancer, lung cancer, and lymphoma. These diseases