Table 5 Correlation between microarray and RT-PCR data. Pearson correlation of expression values between six microarray algorithms and three Real Time RT-PCR algorithms on a subset of 18 genes. The negative sign from the numbers in the second and last column are removed, because a lower ΔCt value means more gene product present, consequently leading to a negative correlation with microarray data. All correlations were significant. ns = not significant (p < 0.01). * = p < 0.05, ** = p < 0.01

From: How to decide? Different methods of calculating gene expression from short oligonucleotide array data will give different results