Background: About 3% of new cancer cases affect young adults aged between 15 and 39 years. The young age, the increasing incidence and the relatively good prognosis of this population lead to the growing importance to investigate the psychosocial long-term and late effects. The aims of the AYA-LE long-term effects study are: first, to assess the temporal course and related factors of life satisfaction and psychological distress of adolescent and young adult (AYA) cancer survivors; and second, to examine a specific topic in each of the yearly surveys in a more differentiated way.Methods: This study represents a continuation of the longitudinal AYA-LE study. The existing sample of AYA cancer patients (t1: N = 577; t2: N = 514; aged between 18 and 39 years at diagnosis; all major tumor entities) was extended by four further survey points (t3: 2018, t4: 2019, t5: 2020, t6: 2021). In addition, a comparison sample of young adults without cancer was collected. We measured longitudinal data for outcomes such as quality of life, psychological distress, and fatigue with standardized questionnaires. Furthermore, each survey point included a different cross-sectional topic (e.g., health behavior, occupational situation, and compliance).Discussion: The AYA-LE long-term effects study will show the long-term consequences of cancer in young adulthood. We expect at least complete data of 320 participants to be available after the sixth survey, which will be completed in 2021. This will provide a comprehensive and differentiated understanding of the life situation of young adults with cancer in Germany. The findings of our study enable a continuous improvement of the psychosocial care and specific survivorship programs for young cancer patients.

Objectives: Having cancer in young adulthood increases the risk of adverse long-term health effects. These risks can be influenced by one’s health behavior (HB). The aim of this study is therefore to investigate the presence of health behavior in adolescents and young adults (AYAs) and to identify associated factors.Design: Young cancer patients (18–39 years old at time of diagnosis) were surveyed at baseline and 12 months later via online or as a paper-pencil version.Methods: A spectrum of indicators for HB was assessed via seven items from the Questionnaire of Multiple Health Behavior (MHB). Multiple linear regression analyses were conducted to determine factors associated with patients’ HB indicators.Results: Five-hundred and fourteen AYAs (75% women) reported the highest level of health-conscious behavior for “avoidance of consumption of nicotine,” “follow medical recommendations,” and “being considerate in road traffic.” Less health-conscious behavior was reported for “keeping an appropriate and balanced diet” and “physical activity.” Significant improvements from baseline to the follow-up were observed for “regularly attending health screening” (Hedges’ g = 0.44). The analyzed factors explained up to 10% of the HB indicators. Women reported significantly more health-conscious behavior than men in four out of seven HB indicators. Higher quality of life (QoL) was associated with more health behavior in three out of seven HB indicators.Conclusion: Findings show a predominantly health-conscious lifestyle in AYA cancer patients, though we also found harmful behavior which needs to be better approached—e.g., through improving AYAs’ health education. AYA men should be particularly targeted in specific prevention and health promotion measures. Future work should identify other factors associated with HB to evaluate targets for intervention.