These results are consistent with antibody 067-213 binding to these human cancer cells being dependent on CD73 expression levels, and affirm the use of MIAPaCa-2 as a model of CD73 high expression and A431 as a model of CD73 low expression in experiments to evaluate the in vitro and in vivo properties of radiolabeled 067-213 as an imaging probe. The gene discussed is NT5E; the disease is cancer.