CCDC66 and malignant colon neoplasm: Recently, it has been reported that circRNA is associated with tumor development, migration, and invasion, for example, circRNA_001569 targeting miR‐145 in the proliferation and invasion of colorectal cancer.6 Circular RNA CCDC66 promotes colon cancer growth and metastasis.7 Overexpression of circRNA_100876 in non–small‐cell lung cancer and its prognostic value.18 Notably, circRNA has been found to play an important role in GC development, migration, and invasion.