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"TAK1 is considered a tumor suppressor in hepatocytes.36 However, signaling network topologies are different between hepatocytes and HCC cells, and specific changes to the connections involving MEKK1 and TAK1 in HCC have been observed.37 Furthermore, the major drug currently used in treating advanced HCC, the multikinase inhibitor sorafenib,10 was recently shown to inhibit TAK1 activity in keratinocytes.38 These data suggest that HCC may involve co-opting TAK1 signaling in later stages of disease progression."