GRP and small cell lung carcinoma: An increasing number of neuropeptides, including bombesin or gastrin releasing peptide, bradykinin, vasopressin, galanin, neurotensin, gastrin and cholecystokinin have been implicated in driving the proliferation of certain SCLC cell lines in an autocrine/paracrine fashion (reviewed by Seckl and Rozengurt, 1998).