<prompt> Growth factor oncogene is -mycfossisjun  <response>: Sis oncogene is a growth factor.Myc, jun and fos oncogenes are nuclear regulatory proteinsFollowing information have been added in 8th e of Robbins miRNA and cancerIt has already been explained in genetics that miRNA is a gene-silencing RNA, i.e. it inhibits gene expression at post-transcription level.So, miRNA can be involved in tumorigenesis in two ways :Reduced activity of miRNA that inhibits translation of an oncogene will result in excess of oncoprotein and tumorigenesis. For example, mRNA inhibits expression of anti-apoptotic gene Bcl 2. Reduced activity of this miRNA results in over-expression of Bcl-2 which inhibits apoptosis and results in leukaemia and lymphoma. Similarly, miRNA mediated upregulation of Ras and Myc oncogenes has been detected in lung tumor and B-cell leukemia, respectively.On the other hand, overactivity of miRNA that targets a tumor suppression gene will result in inhibition of expression of tumor suppressor gene and tumorigenesis. 