Extrapulmonary and pulmonary small‐cell carcinoma: Tumor biology, therapy, and outcome

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Abstract
Extrapulmonary small‐cell cancer is a distinct clinicopathological entity from smallcell anaplastic carcinoma of the lung. Approximately 1,000 cases have been projected annually in the United States, which represents an overall incidence of between 0.1% and 0.4% of all cancer. Not surprisingly then, little information is available regarding the treatment of this disease, which presents a challenge to the clinician when it is regionally confined. The majority of patients with extrapulmonary small‐cell neoplasms have only been treated with local modalities of therapy, surgery, radiation, or a combination of both. Prolonged survival is not infrequent, which is in contrast to the experience for small‐cell lung cancer and surprising given our current systemic approach to patients with this disease. This report will summarize the similarities and differences in biology, natural history, and clinical characteristics of patients with extrapulmonary small‐cell cancer and smallcell anaplastic carcinoma of the lung. The histogenesis of small‐cell cancer is briefly reviewed. A general therapeutic approach to patients with small‐cell lung cancer is reported. Lastly, recommendations for therapy of patients with regionally confined extrapulmonary small‐cell cancer by primary site are outlined.