NCI-H727 [H727] is a cell line exhibiting epithelial morphology that was isolated from the lungs of a 65-year-old, White female with a carcinoid tumor.This is the best differentiated of the available bronchial carcinoid lines. The cells express easily detectable levels of p53 mRNA compared to levels found in normal lung. The cells are able to synthesize the peptide NMB (at 0.1 pmol/mg protein), but not the gastrin releasing peptide (GRP). The cell line secretes a parathyroid hormone-like protein which is calcium stimulated through a protein kinase C pathway. Growth of NCI-H727 cells is inhibited by epidermal growth factor (EGF) receptor monoclonal antibodies.