Cells positive both for GFAP and vimentin, identified as aggressive/invasive tumor cells, increased in number by about 6-fold with post-expansion vs. pre-expansion staining, suggesting that more aggressive/invasive tumor cells are present than previously thought (Fig. 7G, p = 0.0035, 2-tailed paired t-test, n = 3 tissue samples from different patients). Here, GFAP is linked to neoplasm.