CCND1 and non-small cell lung carcinoma: Zhu et al. found a correlation between the upregulation of circRNA 100,876 and NSCLC lymph node metastasis30, hsa_circ_0013958 is thought to be a miR-134 sponge that gives rise to the upregulation of cancer-causing cyclin D1 in lung adenocarcinoma31.