Studies have found that CASC9 expression was elevated in breast cancer,18 colorectal cancer,19 oral squamous cell carcinoma,20 ovarian cancer,21 lung adenocarcinoma,22 gastric cancer,23 and glioma,24 and CASC9 functioned as a tumor promotor in these cancers. Here, CASC9 is linked to oral cavity squamous cell carcinoma.