To test HER2-specificity of 64Cu-CB-TE2A-GEEE-ZHER2:342 and 64Cu-CB-TE2A-G-ZHER2:342 accumulation in tumor in vivo, uptake of both tracers in HER2-positive (SKOV-3) and HER2-negative (Ramos lymphoma) xenografts was measured at 2 h post injection (p.i.). Here, ERBB2 is linked to lymphoma.