MKI67 and skin squamous cell carcinoma: In this study, the results of the correlation analysis on mTOR and Ki-67 expressions in CSCC, BD, and AK revealed that the expression level of mTOR was positively correlated with that of Ki-67 in CSCC, BD, and AK, demonstrating that mTOR is related to the proliferation degree of CSCC, and the higher the proliferation level of squamous cells, the higher the positive expression level of mTOR.