ERBB2 and gastric cancer: Shitara Shitara K K Bang Bang YJ YJ Iwasa Iwasa S S Trastuzumab deruxtecan in previously treated HER2-positive gastric cancer Trastuzumab deruxtecan in previously treated HER2-positive gastric cancer N Engl J Med N Engl J Med 2020 2020 382 382 25 25 2419 2419 2430 2430 10.1056/NEJMoa2004413 10.1056/NEJMoa2004413 supplied-pmid 32469182?