CD24 and non-small cell lung carcinoma: Perhaps, during the selection of CSCs markers, there could be a contradiction in declaration of certain markers used, for example, Roudi et al. (122) mentioned CD44 and CD24 is not a potential CSCs used in A549 cell derived from NSCLC because both CD44+/CD24+ and CD44+CD24low are capable of forming the holoclone, meraclone, and paraclone colonies and develop spheroid formation (122).