As a result of cancer or some benign (noncancerous) disorders, tumours and other cells in the body create compounds known as tumour markers. Some cancer patients’ tissues or bodily fluids, including their blood, urine, stool, tumour tissue, and other tissues, may include these chemicals. Typically, tumour indicators are proteins. But tumour markers are now also being utilised to identify patterns in gene expression and DNA alterations. It is possible to discover tumour markers to diagnose and treat several types of cancer. An increased level of tumour markers can indicate the presence of cancer, but cancer cannot be diagnosed solely based on this information.