XIAP and neoplasm: However, since the oxygenation status was not improved by nifedipine neither the lactate levels (25.7±2.2 vs 27.0±3.5 μmol g−1) nor the ATP concentration (0.79±0.11 vs 0.66±0.08 μmol g−1) markedly changed during nifedipine treatment compared to tumours during ILP without nifedipine.