The mean s-PCSK9-Ab levels (± standard deviation; no units) were as follows: HDs, 231 ± 553; patients with esophageal cancer, 1671 ± 2759; patients with gastric cancer, 1067 ± 1538; patients with colorectal cancer, 1205 ± 4349; patients with lung cancer, 1182 ± 1629; and patients with breast cancer, 884 ± 1138. This evidence concerns the gene PCSK9 and breast cancer.