In the first experiment, the mean percentage of difference between the two replicate measurements and the respective mean value for 29 NE tumor samples and 8 normal tissues was: 3.6% (tumors) or 2.5% (normal samples) for B2M, 3.8% (tumors) or 3.1% (normal samples) for CYYR1 CAG-, and 15.8% (tumors) or 8.9% (normal samples) for CYYR1 CAG+. The gene discussed is B2M; the disease is neoplasm.