Earlier Detection and Optimization of Treatment and Prognosis for Patients With Early-onset Colorectal Cancer

This study focuses on colorectal cancer (bowel cancer) in younger adults — those diagnosed before age 50. Researchers want to understand why this type of cancer is becoming more common in younger people, identify genetic and lifestyle risk factors, and find ways to catch it earlier and treat it better. **You may be eligible if:** - You are between 18 and 49 years old - You have been diagnosed with colorectal cancer (either confined to the area or spread to other parts of the body) - Your cancer has been confirmed by a tissue biopsy - You are able to understand and sign a consent form - You understand Dutch **You may NOT be eligible if:** - Your doctor considers you mentally unable to give informed consent - You cannot understand the Dutch language Talk to your doctor to see if this trial is right for you.