For example, miR‐134 inhibits the proliferation of lung cancer cells by down‐regulating the expression of EGFR. 14It is known that miR‐134 is down‐regulated in gliomas and is negatively correlated with World Health Organization (WHO) glioma grades; the mechanism may involve the promotion of glioma cell migration and invasion by targeting the KRAS gene and activating the ERK signalling pathway.15, 16. Here, KRAS is linked to central nervous system cancer.