Fig. 1From: Targeted next-generation sequencing assays using triplet samples of normal breast tissue, primary breast cancer, and recurrent/metastatic lesionsThe samples with good QC scores (≤0.04) were collected more recently than those with poor QC scores (> 0.04) (P < 0.0005, Mann–Whitney U test). A QC score threshold of 0.04 is recommended by QiagenBack to article page