During human development, HER-3 is expressed in skin, bone, muscle, nervous system, heart, lungs, and intestinal epithelium and is expressed in normal adult human gastrointestinal tract, reproductive system, skin, nervous system, urinary tract, and endocrine system. HER-3 is overexpressed in a variety of tumors including breast, stomach, pancreas, and colon. While no evidence has been found that HER-3 overexpression, constitutive activation, or mutation alone is oncogenic, the protein as a heterodimerization partner, most critically with HER-2, is implicated in growth, proliferation, resistance, and the promotion of invasion and metastasis.
During human development, HER-3 is expressed in skin, bone, muscle, nervous system, heart, lungs, and intestinal epithelium and is expressed in normal adult human gastrointestinal tract, reproductive system, skin, nervous system, urinary tract, and endocrine system. HER-3 is overexpressed in a variety of tumors including breast, stomach, pancreas, and colon. While no evidence has been found that HER-3 overexpression, constitutive activation, or mutation alone is oncogenic, the protein as a heterodimerization partner, most critically with HER-2, is implicated in growth, proliferation, resistance, and the promotion of invasion and metastasis.