TP53 and glioblastoma: Van Meir et al. (1994) [25] showed that LN-229 glioblastoma cells have low expression levels of p53. Thus, we sought to determine whether S100P expression is involved in inducing apoptosis in the first growth phase of the cell cycle; our data revealed a substantial increase cell death in shS100P LN-229 cells treated with DEHP.