For example, Liu et al.27 have shown that MEC cells treated with cisplatin in vitro, compared with untreated tumor cells, exhibit greater PP2A activity (116.7% that of control), as measured by phosphatase detection assays, whereas co-treatment with LB100 and cisplatin decreases PP2A activity to 85% of control levels27. The gene discussed is PTPA; the disease is neoplasm.