The primary objectives of this study are as follows: Phase 1 (sequential dose-escalation): to evaluate the safety and tolerability of sacituzumab govitecan-hziy (SG) as a single agent and to determine the recommended Phase 2 dose (RP2D) of SG in Japanese participants with advance solid tumors. Phase 2: Evaluate the safety and efficacy of SG in Japanese participants with metastatic triple-negative breast cancer (mTNBC), hormone receptor-positive (HR+)/human epidermal growth factor receptor 2-negative (HER2-) metastatic breast cancer (mBC), and metastatic urothelial cancer (mUC).
Phase 1 trials primarily test safety and dosing in a small number of participants (typically 20–100). Results do not yet speak to efficacy. FDA approval is typically many years away from this stage.
Phase 2 trials begin testing efficacy in a larger patient group (100–300). This is often where biotech binary events occur — positive Phase 2 data can significantly advance a company's pipeline narrative, while failures can be terminal for a program.
Enrollment is complete. The trial is in its follow-up or data collection phase — a readout may occur on or near the primary completion date.
Gilead Sciences (GILD) is the sponsoring company for this trial. BiotechSign currently grades this company F (28/100) based on composite catalyst signals across its full pipeline. This trial is one data point in that overall catalyst picture.