Investigating Cognitive Impairment in Young Patients With Cancer Prospectively

This study follows young cancer patients ages 7 to 29 through chemotherapy to understand how treatment affects thinking, memory, and concentration — a problem often called chemo brain. Each patient is matched with a healthy person of similar age from their own social circle for comparison. **You may be eligible if...** - You are 7 to 29 years old - You have been newly diagnosed with a non-brain cancer and will be receiving chemotherapy at University Hospital Copenhagen, Rigshospitalet - You speak and understand Danish **You may NOT be eligible if...** - You have a brain tumor or brain metastases - You have a severe intellectual disability or mental health condition that makes participation too difficult - You are in a terminal stage of illness - You do not speak Danish Talk to your doctor to see if this trial is right for you.