Investigating Cognitive Impairment in Young Patients With Cancer Prospectively

Inclusion Criteria: * Patients who are newly diagnosed with a non-CNS cancer and will undergo chemotherapy at University Hospital Copenhagen, Rigshospitalet. * At the age of 7-29 years at diagnosis * Each patient is matched (1:1) with a control participant within 24 months of age. The controls are recruited from the patient's own social circle and can be a friend, partner, or close family (sibling or cousin). Exclusion Criteria: * Unable to speak and understand Danish * Severe intellectual disability or mental health disorder that hinders participation * Brain metastases, * Terminal illness * Have had a previous chemotherapy or radiotherapy treatment