Final answer:
HER2 is a receptor tyrosine kinase that is present in excessive amounts in 20 percent of human breast cancers. The drug Herceptin targets HER2 for removal by the immune system and helps to reduce tumor growth. Side effects of Herceptin can include flu-like symptoms, heart problems, and allergic reactions.
Step-by-step explanation:
HER2 is a receptor tyrosine kinase that is present in excessive amounts in 20 percent of human breast cancers. When breast cancer tests positive for HER2, the drug Herceptin (trastuzumab) is used. Herceptin is a monoclonal antibody that targets HER2 for removal by the immune system. Its mechanism of action is to control signaling through HER2, helping to reduce tumor growth. The side effects of Herceptin can include flu-like symptoms, heart problems, and allergic reactions.