TGFB1 and acute myeloid leukemia: To investigate if 1D11 efficiently abrogates the TGF-β1 mediated prosurvival effect on AML cells under hypoxic condition, Ara-C exposed MV4;11 cells were subjected to the treatment with rhTGF-β1 with/without 1D11 or 13C4 under normoxic and hypoxic conditions.