Hi there, Stage 1 carcinoma endometrium has very high cure rates and relapse is very rare though possible. Blood tests are non contributory to confirm or deny any relapse. Only imaging like CTscan or PET scan can really detect recurrence (Ultrasound
to a certain extent as well and not to forget clinician's vaginal exam which is paramount). If you have symptoms like bleeding PV or other significant symtoms like loss of weight, loss of appetite etc, request oncologist's review.