On the Destiny of (Copper) Species

The study by Hueting et al. ([1][1]) in this issue of The Journal of Nuclear Medicine reporting the biodistribution of the putative hypoxia tracer 64Cu-diacetyl- bis ( N 4-methylthiosemicarbazonate) (64Cu-ATSM) and that of its precursor 64Cu-acetate in mice bearing CaNT or EMT6 xenograft tumors is a