Survival was not significantly different by age (p = .053), sex (p = .461), carcinoid symptom (p = .646), primary tumor origin (p = .660), presence of liver metastasis (p = .995), elevation of biomarkers (p = .653 for urine 5-HIAA; p = .051 for serum NSE), and treatment modality (local treatment only vs. systemic treatment only vs. both treatments, p = .245). This evidence concerns the gene ENO2 and neoplasm.