ERBB2 and lymphoma: The tumor uptake at 46 h p.i. in mice bearing RAMOS lymphoma xenografts (HER2 negative) was 6–10-fold lower compared to that in SKOV-3 xenografts: 0.9% ± 0.1%, 0.6% ± 0.1%, and 0.6% ± 0.2% ID/g for (ZHER2:2891)2–ABD–MC-DM1, (ZHER2:2891)2–ABD–E3–MC-DM1, and (ZHER2:2891)2–ABD–E6–MC-DM1, respectively (Figure S2).