Tumor uptake of ⁹⁹Tc(m) polyphosphate: its similarity with ⁸⁷Sr(m) citrate and dissimilarity with ⁶⁷Ga citrate

Some differences in the uptake of three radiopharmaceuticals by a metastatic lesion from primary adenocarcinoma of the rectum are presented. A large tumor on the abdominal wall metastasized from rectal cancer picked up ⁹⁹Tc(m) polyphosphate and ⁸⁷Sr citrate but not ⁶⁷Ga citrate. This tumor uptake of Tc polyphosphate and strontium was not attributable to increased tumor vascularity as evidenced from negative ¹¹³In transferrin scan.