marginal significanceP value = 0.0678
Moreover, A549LC cells acquired greater tumorigenic activity than A549 cells in vivo because the implanted A549LC cells doubled the growth of the implanted parental A549 cells, 0.21 ± 0.04 g versus 0.1 ± 0.03 g with marginal significance ( P value = 0.0678, n = 7, Additional file 1 : Figure S1).