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Cell survival rates of SK-BR-3, BT474 and PIEC cells following treatment with INHS, NHS and/or trastuzumab. SK-BR-3, BT474 cells incubated with 50% INHS, 50% NHS, 50 µg/ml trastuzumab and 50 µg/ml trastuzumab + 50% NHS for 1 h at 37°C. PIEC cells were included as a positive control (~100% lysis rate in NHS). *P<0.05 compared with INHS group. INHS, inactivated normal human serum; NHS, normal human serum.
