Non-small cell lung carcinomas (NSCLC) overexpress the Her2/neu gene in 
approximately 59% of cases. Trastuzumab, a humanized monoclonal antibody, 
interferes with Her2 signaling and is approved for the treatment of Her2/neu 
overexpressing breast cancer. However, its therapeutic use in Her2/neu 
overexpressing NSCLC remains obscure. The present study aimed to determine the 
role of (64)Cu-labeled trastuzumab positron emission tomography (PET) for 
non-invasive imaging of Her2/neu expression in NSCLC. Trastuzumab was conjugated 
with the bifunctional chelator 1, 4, 7, 10-tetraazacyclododecane-1, 4, 7, 
10-tetraacetic acid (DOTA) and radiolabeled with (64)Cu. The molecular 
specificity of DOTA-trastuzumab was determined in NSCLC cell lines with Her2/neu 
overexpression (NCI-H2170) and negative expression (NCI-H520). Imaging of 
Her2/neu expression was performed in NCI-H2170 tumor-bearing mice with 
(64)Cu-DOTA-trastuzumab PET and (64)Cu-DOTA-IgG. In vitro studies revealed 
specific binding of DOTA-trastuzumab in the Her2/neu positive NCI-H2170 cells, 
while no binding was seen in the Her2/neu negative NCI-H520 cell line. 
Biodistribution and PET studies revealed a significantly high accumulation of 
(64)Cu-DOTA-trastuzumab in the Her2/neu overexpressing NCI-H2170 tumor at 24 and 
48 h post-injection (21.4 +/- 1.4% and 23.2 +/- 5.1% injection dose/gram (% 
ID/g), respectively). PET imaging of Her2/neu negative NCI-H520 tumors showed 
much less uptake of (64)Cu-DOTA-trastuzumab (4.0% ID/g). The NCI-H2170 tumor 
uptake of (64)Cu-DOTA-trastuzumab was significantly higher than that of 
(64)Cu-DOTA-IgG (P < 0.0001). (64)Cu-DOTA-trastuzumab showed a very clear image 
of a Her2/neu positive tumor and appeared to be effective as a PET tracer for 
imaging of Her2/neu gene expression in NSCLC, suggesting its potential clinical 
use for identifying patients that might benefit from trastuzumab-based therapy.