However, other studies have demonstrated that PP2A also counteracts apoptotic cell death, by showing that inhibition of PP2A increases progression of cell cycle in the presence of cytotoxic chemotherapeutic drugs [26], and also enhances radiation-induced mitotic catastrophe and tumour growth delay in glioblastoma [27], thereby facilitating the effectiveness of various cancer therapies. Here, PTPA is linked to glioblastoma.