A CTC test for cancer does not fit everyone and you obviously have the right to refuse if a doctor suggests a test. You must be prepared for the result if it turns out positive and feel ready to take the necessary next steps that a positive test result entails.
Of course, a positive CTC test result is an emotional strain. It is also in the nature of the test that the answer can be positive without cancer being confirmed by more established examination methods, which can increase the emotional burden. It is always best to consult your doctor to make an informed decision about the next step. (See below under "CTC was found in my blood sample, but no primary tumor could be identified. How can that be?").
Not taking the test may allow you to feel better for the time being, but at the same time reduce your chances of early cancer detection. Should there be cell abnormalities, you will increase your chances of long-term recovery if you take the test regularly.
Once a cancer begins to give symptoms, it has usually been developed for a long time, sometimes for many years. At a later stage in the course of the disease, cancer is often much more difficult to treat, sometimes even impossible, than if it is detected early. These are facts that should be taken into consideration when deciding whether or not to take an offered CTC test.
Making healthcare decisions is an individual right, but it might be appropriate to also factor in those who are affected by your healthcare decisions, such as family and friends. Sometimes it may be wise to undergo a test not only for your own sake, but also for people who are close to you and who might be worried.