CD44 and lung adenocarcinoma: For instances, circPUM1 facilitates the malignance of lung adenocarcinoma via regulating miR‐32628; HOTAIR‐miR‐326‐FUT6 axis promotes colorectal cancer progression by modulating fucosylation of CD44 through PI3K/AKT/mTOR pathway29; hsa_circ_0003998 accelerates cell proliferation and invasion via absorbing miR‐326 in non–small‐cell lung cancer30; and lncRNA H19, in contrast to miR‐326, is overexpressed and predicts poor survival in glioblastoma.31 Mechanism assays certified that circ‐TFF1 promotes TFF1 expression by absorbing miR‐326.