What is the fine-grained topic of the following text: microRNA (miRNA) is considered to be a pivotal role in human numerous biological process, and their abnormal expression that functions either as tumor suppressor or oncogenes results in human cancer initiation and development microRNA-141 (miR-141), belonged to the miR-200 family, located at 12p13.31 and is also found to be abundantly expressed in many human cancers. Only return the topic.
The role and expression of microRNA-141 in human cancer initiation and development.