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Ann Thorac Surg 2000;70:258-263
© 2000 The Society of Thoracic Surgeons

Original articles: General thoracic

Prognostic factors in neuroendocrine lung tumors: a Spanish multicenter study

Mariano García-Yuste, MDa, José M. Matilla, MDa, Tomás Alvarez-Gago, MDa, José L. Duque, MDa, Félix Heras, MDa, Luis J. Cerezal, MDa, Guillermo Ramos, MDa, the Spanish Multicenter Study of Neuroendocrine Tumors of the Lung of the Spanish Society of Pneumonology and Thoracic Surgery (EMETNE-SEPAR),*

a Services of Thoracic Surgery and Pathology, University Hospital, Valladolid, Spain; and Members of the Spanish Multicenter Study of Neuroendocrine Tumors of the Lung of the Spanish Society of Pneumonology and Thoracic Surgery (EMETNE-SEPAR)

Address reprint requests to Dr García-Yuste, Thoracic Surgery Service, University Hospital, C/. Ramón y Cajal, 3, 47005 Valladolid, Spain

Background. This study examines the experience of the Spanish Multicenter Study of Neuroendocrine Tumors of the Lung through the clinical data and behavior of patients treated for this pathologic process.

Methods. From 1980 to 1997, 361 cases of neuroendocrine carcinomas (NEC) were treated surgically. Patients were enrolled in a protocol using the pathologic and follow-up reports. According to Dreslers’ criteria, the cases were segregated into grade 1 (typical carcinoid), grade 2 (atypical carcinoid), grade 3 large cell type, and grade 3 small cell type. Several variables were reviewed in all patients. Statistical analysis was performed to determine whether clinical characteristics and differentiation were associated with significant differences in the prognosis.

Results. A total of 261 cases of NEC were identified with grade 1, 43 with grade 2, and with grade 3: 22 of large and 35 of small cells. Five-year survival for different grades was as follows: grade 1, 96%; 2, 72%; 3 large cell type, 21%; and 3 small cell type, 14%. When a comparative analysis between typical and atypical carcinoids was performed a significant difference for mean age, tumor size, nodal metastases, and recurrence was observed. However, female sex, nodal metastases, and recurrence rate differed between atypical carcinoids and grade 3 NEC of large cells. A difference in recurrence rate was found between patients with both types of grade 3 NEC.

Conclusions. The progressive deterioration of tumor organization highlights that neuroendocrine tumors constitute a continuous spectrum. A careful observation of pathologic findings is necessary to individualize their prognostic factors.




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