BCL2 and lung carcinoma: It was also documented that miR‐7, which was positioned on chromosome 15, held up the growth of lung cancer cells (ie A549) through down‐regulating Bcl‐2 expression.40 Webster et al41 also speculated that miR‐7 might directly restrain the expression of v‐raf‐1 murine leukemia viral oncogene homologue and the Raf‐related signal transmission, finally controlling the proliferation of lung cancer cells.