Should extrapulmonary small cell cancer be managed like small cell lung cancer?

• Published in: Cancer Vol. 116; no. 4; pp. 888 - 895
• Main Authors: Brennan, Sinead M., Gregory, Deborah L., Stillie, Alison, Herschtal, Alan, Mac Manus, Michael, Ball, David L.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.02.2010; Wiley-Blackwell
• Subjects: Biological and medical sciences; Brain; Brain Neoplasms - prevention & control; Cancer; Carcinoma, Small Cell - mortality; Carcinoma, Small Cell - therapy; chemoradiotherapy; chemotherapy; Combined Modality Therapy; Cranial Irradiation; extrapulmonary small cell carcinoma; Female; Gastrointestinal Neoplasms - pathology; Genital Neoplasms, Female - pathology; Head and Neck Neoplasms - pathology; Humans; Lung cancer; Male; Medical sciences; Neoplasms, Unknown Primary - pathology; Palliative Care; Pneumology; Prognosis; prophylactic cranial irradiation; Radiography; radiotherapy; small cell lung cancer; Smoking; surgery; survival; Tumors; Tumors of the respiratory system and mediastinum; Urogenital Neoplasms - pathology; Weight Loss; Lung disease; Respiratory disease; Lung cancer; Bonchopulmonary small cell carcinoma; Malignant tumor; Radiotherapy; Chemoradiotherapy; Prevention; Cancerology; Treatment; Extrapulmonary; Irradiation; Bronchus disease; prophylactic cranial irradiation; small cell lung cancer; Small cell carcinoma; extrapulmonary small cell carcinoma; Cancer
• DOI: 10.1002/cncr.24858
• ISSN: 0008-543X; 1097-0142

BACKGROUND: The aim of this study was to determine if extrapulmonary small cell carcinomas (EPSCC) should be managed using protocols similar to those for small cell lung cancer (SCLC). METHODS: Treatment strategies, survival, patterns of failure, and prognostic factors for patients with EPSCC were analyzed retrospectively at a large cancer center. SCLC was excluded by thoracic computed tomography (75%) or chest radiography (25%). RESULTS: Of 120 eligible patients, 70% had limited disease (LD). Treatment modalities included chemotherapy (n = 82; 68%), radiotherapy (RT) (n = 80; 67%), and surgery (n = 41, 34%). The median survival for patients with LD and extensive disease was 1.4 years and 0.7 years, respectively. Gynecologic (n = 31) and gastrointestinal (n = 28) were the most common primary tumor sites. Gynecologic and head and neck primary tumor sites had better 1‐year survival than other sites (P = .019 and 0.005, respectively). Brain metastasis was the site of first distant failure in 4.1% of patients versus 35% for soft tissue metastases. The lifetime risk of brain metastasis was 13%. Definitive RT (P = .004), LD (P = .028), and prophylactic cranial irradiation (PCI) (P = .022) were found to be positive prognostic factors and weight loss (P < .001) was a negative prognostic factor on multivariate analysis. CONCLUSIONS: Patients with EPSCC usually experienced short survival, often with early distant metastasis. Although PCI was associated with improved overall survival, brain metastasis was less frequent than in patients with SCLC, and therefore the potential benefit of PCI was less than in patients with SCLC. Definitive chemoradiotherapy was associated with better outcomes and should be delivered whenever feasible. Cancer 2010. © 2010 American Cancer Society. The objective of the current study was to determine whether it was reasonable to apply management strategies designed for small cell lung cancer (SCLC) to patients with extrapulmonary small cell carcinoma. Although prophylactic cranial irradiation (PCI) was associated with improved overall survival, brain metastasis was less frequent than in SCLC and, therefore, the potential benefit of PCI was less than in SCLC.