Tumour markers are usually glycoproteins (soluble molecules) in the blood, which can be detected by monoclonal antibodies. Highly raised levels of a tumour marker can provide helpful information but inappropriate use can have economic implications and cause patients additional anxiety and distress. Additionally, unnecessary investigations may be associated with side-effects and may delay correct diagnosis and treatment.1
This is a companion discussion topic for the original article at https://patient.info/doctor/oncology/tumour-markers