HER2 - Definition

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HER2 is a protein that acts on epidermal tissue growth. It therefore has a stimulating effect on cell multiplication. HER2 contains 1,255 amino acids. This protein can be found in cancerous tumor cells in 1/3 of cases of breast cancer. If it mutates, either by an increase or decrease in the number of its genes, this can cause the spread of cancerous cells. When tumors are linked to HER2, this is a life-threatening condition, as the cancer is more aggressive and metastatic.