BANP and colorectal cancer: For example, circRNA_100269 and the mRNA of its linear isomer latrophilin 2 (LPHN2) are both down‐regulated in gastric cancer.12 CircBANP is overexpressed in colorectal cancer, while BTG3‐associated nuclear protein (BANP; also known as SMAR1) inhibits cyclin D1 gene suppression and functions as a tumour suppressor.13 However, knowledge of the expression and function of circRNAs in ovarian cancer is limited.