We also evaluated antitumor activity of SGN-CD228A in melanoma and NSCLC xenograft and PDX models. In the Colo-853 and Sk-Mel-5 melanoma models, a single dose of 0.33 mg/kg caused tumor delay whereas 1.0 mg/kg resulted in 5/8 and 4/8 durable complete responses (CRs), respectively...In summary, CD228 is a highly expressed carcinoma target and the novel glucuronide-MMAE ADC, SGN-CD228A, shows potent antitumor activity in vitro and in vivo.