Figure 3. The discriminative power of the CR-related signature. (A) Principle component analysis (PCA) demonstrated that low-risk group was apparently distinct from high-risk group in Dim 1 in the training set. (B) As risk score increased, chance of tumor recurrence increased in the training set. (C) Principle component analysis (PCA) showed that the low-risk group was apparently distinct from the high-risk group in Dim 1 in the validation set. (D) As risk score increased, chance of tumor recurrence increased in the validation set.