General characteristics of circRNAs in primary breast cancer. (A) Numbers of unique and recurrent circRNAs. Purple and gold indicate the number of circRNAs that, respectively, did or did not have a start and end position of a circRNA region exactly matching the start and end position of an exon of the same gene. (B) The number of circRNAs per sample, grouped by ER status. In black, the total number of circRNAs; in peach, the number of recurrent (identified in at least two samples) circRNAs. (C) Violin plots of the intron size (in log base pair) of noncircular regions and those located directly upstream of or downstream from a circRNA region.
