Gemcitabine triphosphate (trisodium) is one of the two nucleoside metabolites of Gemcitabine in cells. The other is active diphosphate (dFdDTP). Gemcitabine triphosphate can be used as a standard in radio-labeled probe imaging studies, to identify tumors sensitive to Gemcitabine , and to evaluate Gemcitabine uptake and retention by cells.