Answer
When cells are populated with cancers cells; they produced certain substances in response to the cancerous growths. These substances are called tumor markers.However these (substances) can also produced by normal cells in a non- cancerous conditions in response to other diseases conditions.
The clinician should conclude from above analysis that;........ ''Therefore, they are not enough for diagnosis of cancer growth to give a positive or negative confirmation of tumor. The man should be told that; they are not effective screening tools for cancer''.
They are measured from levels in the blood or urine.
Explanation:
