The biochemical examination of blood did not revealed abnormalities, and levels of tumor markers carcinoembryonic antigen (CEA) was 2.9 ng/ml, squamous cell carcinoma antigen (SCC) was 0.6 ng/ml, Cyfra21-1/cytokeratin 19 fragment (CYFRA) 0.96 ng/ml, and neuron-specific enolase (NSE) was 3.2 ng/ml. This evidence concerns the gene ENO2 and neoplasm.