background: the her-2/neu gene is located on chromosome 17q21 and encodes a 185-kda transmembrane glycoprotein with tyrosine kinase activity reported to be released in soluble form in various malignancies. objective: to evaluate the clinical significance of soluble her-2/neu as a diagnostic marker in lung cancer. methods: serum levels of soluble her-2/neu were measured in 43 patients with lung ...