In phase Ia dose escalation utilizing a “3+3” design, a total of 25 pts with BC (19), SGC (3), GC (2), and CRC (1) were enrolled to identify MTD/RP2D….The starting dose of MRG002 was 0.3 mg/kg, followed by 0.6, 1.2, 1.8, 2.2, 2.6, and 3.0 mg/kg, all pts with BC and GC had HER2+ per CAP guidelines....The dose escalation of MRG002 showed manageable safety profile and encouraging antitumor activity in pts with HER2+ solid tumors including BC, GC...