A personalized website (username/password) will become available to patients assigned to the intervention arm for 12 subsequent weeks. Key features of the website are self-screening, tailored patient education and self-referral. Self-screening will be performed by an online version of the Dutch Distress thermometer (DT) and Problem List (PL). Patients will receive digital feedback on their DT score immediately after test completion together with information regarding problems reported on the PL, (self)help options and possibilities for referral to professional care. Contact information of one of the investigators will also be available to discuss questions, problems and/or referral needs. Patients may also request a telephone call.

Patients assigned to standard convalescent care will receive the usual follow-up care delivered by their treating oncologists. Patients will be referred to psychosocial or allied care by their oncologist and/or oncology nurse if certain physical and/or psychosocial problems require more in-depth professional care

Patients' optimism and control over the future will be measured by the subscale 'increased optimism and control over the future' of the 'Constructs Empowering Outcomes Questionnaire'. The subscale 'optimism and control over the future' represents a single concept/outcome measure. The concept cannot be assessed at baseline due to the retrospective nature of the questionnaire.

Patient knowledge level will be measured by the subscale 'being better informed' of the 'Constructs Empowering Outcomes Questionnaire'. The concept cannot be assessed at baseline due to the retrospective nature of the questionnaire.