Antineoplastic Combined Chemotherapy Protocols/therapeutic use; Carcinoma, Small Cell/surgery; Lung Neoplasms/surgery; Adult; Aged; Antibiotics, Antineoplastic/administration & dosage; Antineoplastic Agents/administration & dosage; Antineoplastic Agents, Alkylating/administration & dosage; Antineoplastic Agents, Phytogenic/administration & dosage; Carcinoma, Small Cell/drug therapy; Carcinoma, Small Cell/pathology; Carcinoma, Small Cell/radiotherapy; Chemotherapy, Adjuvant; Cisplatin/administration & dosage; Cranial Irradiation; Cyclophosphamide/administration & dosage; Doxorubicin/administration & dosage; Epirubicin/administration & dosage; Etoposide/administration & dosage; Female; Follow-Up Studies; Humans; Longitudinal Studies; Lung Neoplasms/drug therapy; Lung Neoplasms/pathology; Lung Neoplasms/radiotherapy; Male; Middle Aged; Neoplasm Recurrence, Local/pathology; Neoplasm Staging; Pneumonectomy/adverse effects; Pneumonectomy/methods; Postoperative Complications; Prospective Studies; Radiotherapy, Adjuvant; Survival Rate; Vincristine/administration & dosage