Prevention of Oxaliplatin-induced Nerve Damage in the Body's Extremities

Inclusion Criteria: * Histopathologically verified adenocarcinoma of the colon or rectum and planned standard adjuvant treatment with capecitabine in combination with oxaliplatin. * ECOG performance status 0-2 (measurement of a patient's function in terms of self-care, daily activity and physical ability. * Written and orally informed informed consent Exclusion Criteria: * Inability to speak, read, and understand Danish. * Previous treatment with neurotoxic chemotherapy. * Neurological (including neuropathy) or psychiatric disorders, diabetes or other significant medical conditions. * Alcohol or drug abuse. * Sensory disturbances in the feet * Spinal stenosis. * Vascular disease (Fontaine grade II or more). * Known allergy to fish, fish oil or corn oil * Fertile patients not willing to use effective methods of contraception during treatment or abstinence. * Daily intake of oil supplements and not willing to stop during the trial period. * Lack of consent to skin biopsy