Figure 6. Tumor growth and metastasis promoted by LC-MSCs. 106 each of A549.Luc cells and LC-MSCs or TF-MSCs were co-implanted subcutaneously into female Balb/c nude mice. Tumor growth was monitored by bioluminescence imaging. (A) Bioluminescence images at the indicated time. (B) Total bioluminescence of tumors at indicated time. (C) Bioluminescence images of sentinel lymph nodes from sacrificed mice at the end of experiment. (D) Immunohistochemistry test for Ki67 in tumor tissues. *, P < 0.05 were considered to be statistically significant.