thank u for replying . i need to measure the level of expresssion of mRNA OF ERBB2 IN breast cancer and i read article confrm that there is mRNA ERBB2 CELL CIRCULATING IN BLOOD BUT other aricle confirm that they cand detect mRNA OF ERRBB2 IN PLASMA BCZ THAT I AM NOT SURE IF I UES WHOLE BLOOD DIRECTLY TO REACTION IS GOING TO WORK OR NOT