No matter what type of cancer a person has, when it is known to have metastasized doctors will usually treat the person immediately with angiostatins and endostatins. why is this done even if they don't know what caused the cancer

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.