A) Cytotoxicity induced on HER2 3+ EOC cells (KRCH31), HER2 1+/0 USC cells (ARK-4), and KRCH31/ARK-4 co-cultures with 1μg/ml of SYD985. A significant increase of killing of HER2 1+/0 USC cells was detected when compared to control (p= 0.001) after treatment with SYD985. B) Cytotoxicity induced on HER2 3+ EOC cells (KRCH31), HER2 1+/0 USC cells (ARK-4), and KRCH31/ARK-4 co-cultures with 1μg/ml of SYD995 (T-DM1). No significant increase of killing of HER2 1+/0 USC cells was detected when compared to control (p= 0.29) after treatment with T-DM1. C) Cytotoxicity induced on HER2 3+ EOC cells (KRCH31), HER2 1+/0 USC cells (ARK-4), and KRCH31 /ARK-4 co-cultures with 1μg/ml of SYD989 (isotype control ADC). No significant increase of killing of HER2 1+/0 USC cells was detected when compared to control (p= 0.51) after treatment with isotype control ADC.