We found that 17 PHF genes, including PYGO2, KDM5B, PHF20L1, and ZMYND8, had a higher frequency (>10%) of gain/amplification, and 9 PHF genes, including CHD3 and PHF23, had a higher frequency of deletion in the METABRIC breast cancer samples (Supplementary Table S6), although the frequency of gain/amplification identified in the METABRIC dataset is lower than that of TCGA dataset, possibly due to the different CNA analysis platforms and calling algorithms. This evidence concerns the gene PHF20L1 and breast cancer.