ENO2 and small cell lung carcinoma: Furthermore, a study of 301 cases of small cell lung cancer (163 limited-stage cases, 54.2%; 138 extensive-stage cases, 45.8%) found that nutritional status before treatment initiation and NSE level (15 ng/mL) were prognostic factors, in addition to the treatment strategy (localized-stage or extensive-stage chest irradiation).