What is a tumour marker?
Many pancreatic cancers produce a tumour marker called CA 19-9.
CA 19-9 and pancreatic cancerYour doctor may test a sample of your blood for CA 19-9. This can sometimes help diagnose pancreatic cancer. But some people who have pancreatic cancer do not have raised levels of CA 19-9.
Also, other conditions, such as jaundice that has not been caused by cancer, may cause high levels of CA 19-9. Doctors will consider these things when looking at your test results.
Doctors may also measure your level of CA 19-9 during treatment and follow-up. This is because it can also show how pancreatic cancer is responding to treatment.