A tumor marker is a substance that can be produced by human body in response to cancer, or can be produced by the cancer itself. Tumor makers are generally used to evaluate the patient's response to treatments(drugs) or to monitor recurrence. Tumor makers can help a doctor to determine prognosis or proper treatments.
A wound is a break or opening in the skin. Your skin protects your body from germs. When the skin is broken, even during surgery, germs can enter and cause infection. Wounds often occur because of an accident or injury.