Particular receptor tyrosine kinases (RTKs) that promote excessive cell division are found at high levels on various cancer cells. A protein, Herceptin, has been found to bind to an RTK known as HER2. HER2 is sometimes excessive in cancer cells. This information can now be utilized in breast cancer treatment if which of the following is true?
A) If injection of HER2 in the patient's cancer cells stimulates cell division
B) If the patient's cancer cells have excessive levels of HER2.
C) If the patient's genome codes for the HER2
D) If the patient has excessive levels of other RTKs in cancer cells
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