Recent studies have found that the abnormal expression of Circ-ABCB10, also known as hsa_circ_000871, may be involved in the occurrence and development of many different tumors, such as esophageal squamous carcinoma cells, glioma, non–small cell lung cancer, oral squamous cell carcinoma, lung cancer, epithelial ovarian cancer, breast cancer, thyroid cancer, and hepatocellular carcinoma (Cortés-López and Miura, 2016; Wang et al., 2017). The gene discussed is ABCB10; the disease is breast cancer.