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Do not massage the injection site, as this can disperse the peptide too quickly or cause irritation
Based on the presence of three different receptors, i.e., estrogen receptor (ER), progesterone receptor (PR), and human epidermal growth factor receptor 2 (HER2), breast cancer is broadly categorized into 4 subtypes, i.e., basal/triple negative, HER2, luminal A, and luminal B
Circulating levels peak in early adulthood and decline significantly with age dropping from roughly 200 ng/mL at age 20 to approximately 80 ng/mL by age 60
Nat Rev Immunol (2004) 4:1819
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