ERBB2 and breast cancer: Cancer cells metabolize in even greater quantities of amino acids that describe the activity of proliferative processes (Ser, Cys, Gln, BAAC, Gly), the remodeling of collagen fibers for the growth and metastasis of tumor cells (Ala), and the synthesizing of fatty acids as distinctive features of the HER2+ subtype of breast cancer (Cys), which has more suppressed immunity (Trp).