Innovent declares Phase 3 success for gastric cancer ADC that attracted huge Takeda deal on June 05, 2026 arcotatug Claudin-18 Isoform A2 IBI343 Innovent Biologics N-methyl-N-2-(methylsulfinyl)ethylpropionic acid amide NMPA TAK-921 Takeda tavatecan therapeutic autologous dendritic cells +