Phase I Study of Oral BAY 1217389 in Combination With Intravenous Paclitaxel

"BAY1217389 will be given orally, with a starting dose of 0.25 mg twice daily, on D1, D2, D8, D9, D15 and D16 of a 28 day cycle. BAY1217389 will be dosed in combination with paclitaxel in Arm 1 (Experimental Treatment) and from Cycle 2 onwards in Arm 2 (Standard Treatment).~After Maximum tolerated dose (MTD) has been defined, expansion cohorts will be conducted at the MTD dose of BAY1217389 and paclitaxel following an intermittent dosing schedule as defined in the dose escalation phase. Up to 12 to 15 breast cancer (triple negative) subjects are planned to be enrolled in the expansion cohort.~In a higher dose level Cohort 4 \> (or equal to) a relative bioavailability assessment of BAY1217389 liquid capsule formulation compared to BAY1217389 oral solution will be performed."

Paclitaxel will be given once per week IV at 90 mg/m\^2 on D1, D8, and D15 of a 28 day cycle. Paclitaxel will be dosed as a single-agent in Cycle 1 of Arm 2 (Standard Treatment Arm), and in combination with BAY1217389 in Arm 1 (Experimental Treatment Arm) and from Cycle 2 onwards in Arm 2 (Standard Treatment Arm). After Maximum tolerated dose (MTD) has been defined, expansion cohorts will be conducted at the MTD dose of BAY1217389 and paclitaxel following an intermittent dosing schedule as defined in the dose escalation phase. Up to 12 to 15 breast cancer (triple negative) subjects are planned to be enrolled in the expansion cohort.