Moreover, we confirmed the following facts: 1) that the level of Rb1 protein expression was also reversely correlated with that of MCRS1; 2) that the increase in the level of Rb1 protein caused by MCRS1 knockdown was decreased by upregulating the level of miR-155 in NSCLC cells, whereas decreasing the level of Rb1 protein in the MCRS1 upregulated cells could be increased by downregulating the expression of miR-155. The gene discussed is RB1; the disease is non-small cell lung carcinoma.