Hello, in all breast cancer patients, about 20%-30% patients will have HER2 (human epidermal growth factor receptor 2) positive phenomenon.

As a proto-oncogene, HER2 expresses a dangerous signal and factor, and its status shows that the patient's survival time is short, the patient is more prone to relapse, and the treatment effect is better. Without treatment, the survival time of HER2 positive breast cancer patients is 1-3 years, and the survival time of HER2 negative breast cancer patients is at least 4-6 years.