Variability of select candidate endogenous control genes in combined TCGA data sets.

Mean relates to RPKM values within each data set. CV indicates the coefficient of variation and equals the standard deviation divided by the mean RPKM, expressed as a percentage. MFC, mean fold change, represents the maximum divided by minimum RPKM value of the data set. Score represents the sum of the number of datasets (out of 10 total) which have a CV均值对应各数据集内部的每百万比对读段的转录本每千碱基读段数（Reads Per Kilobase of transcript per Million mapped reads, RPKM）数值。变异系数（Coefficient of Variation, CV）为标准差与平均RPKM值的比值，以百分比形式呈现。平均倍数变化（Mean Fold Change, MFC）指数据集内RPKM最大值与最小值的比值。得分代表在全部10个数据集当中，具备有效CV值的数据集数量之和。