Analysis of Surveillance, Epidemiology, and End Results Database for Carcinoid Tumors  Dr Arnold M. Schwartz, MD, PhD, Dr Donald E. Henson, MD  CHEST  Volume 148, Issue 3, Pages e104-e105 (September 2015) DOI: 10.1378/chest.15-1159 Copyright © 2015 The American College of Chest Physicians Terms and Conditions

Figure 1 Log (age-specific incidence per 100,000) vs log (age at presentation) for small cell neuroendocrine carcinoma of the lung (solid line) and for typical pulmonary carcinoid (dashed line). Note that the curves are nearly linear, conforming to multistage carcinogenic pathways, and that the curves are not parallel, indicating that the carcinogenic pathways do not overlap. CHEST 2015 148, e104-e105DOI: (10.1378/chest.15-1159) Copyright © 2015 The American College of Chest Physicians Terms and Conditions