my name is evgenia almaeva. i am from the city of oktyabrsky, republic of bashkortostan , and i am very glad that i had the opportunity to ask you a question. i think you can explain to me. the point is that i'm trying. uh regularly. keep track of your health and attend checkups by various doctors recently. and i saw an ad in the elevator, and there were written tests for tumor markers. here, tell me, please, what is it? isn't this a hoax? is it possible to trust such advertising leaflets and if this is not a hoax, then how often do you need to take these tests and what age do you understand? there is a twofold situation here. this is not cheating. indeed, there is a tumor marker, but it is not necessary to ask them to healthy people. do you understand what the tumor is in the process of its life activity, can produce certain proteins, which can increase in the blood and in their elevated level. we say, aha, since this protein is elevated. so, there is a tumor that produces. it would seem that the logic is simpl