MKI67 and neoplasm: Our results showed that there was a significant difference in the number of Ki-67-reactive tumor cells in the subcutaneous nodules between the two groups (the Ki-67 indexes of the subcutaneous nodules were the following: A549- pLenti-NSRNA, 68.98±2.56%; A549- pLenti-shRNA1, 28.63±2.38%; P<0.05; NCI-H520- pLenti-TC-1, 86.26±3.16%; NCI-H520- pLenti-LacZ, 51.34±1.78%; P<0.05).