Representative examples of microsatellite analysis for D16S3018 in breast cancer patients with paired tumor-blood samples. (a) Loss of heterozygosity at D16S3018. The arrow indicates the allele loss. (b) Retention of heterozygosity. (c) Uninformative sample due to the homozygosity at D16S3018. Each peak has a box that provides the fragment size and peak height (upper and lower labels, respectively).