 Inclusion is allowed immediately prior to or within 12 weeks of the start of treatment. If surgery was performed initially and is followed by systemic treatment or radiotherapy, start of systemic treatment or radiotherapy is counted as first treatment. Prior treatment -including chemotherapy- for a different, prior malignant tumor is allowed. Concomitant participation in an experimental therapeutic drug trial is allowed. Age 18 years. Command of the German language. Internet access and basic computer skills. Life expectancy of 6 months. 