title: Preferential accumulation of (3)H-tetraphenylphosphonium in non-small cell lung carcinoma in mice: comparison with (99m)Tc-MIBI.
abstract: We have previously shown enhanced accumulation of the delocalized lipophilic cation (11)C-triphenylmethylphosphonium in canine brain glioma, suggesting its potential use for tumor staging in humans using PET. Here, we extend our studies of phosphonium cations to nonbrain tumors and characterize the biodistribution and tumor specificity of (3)H-tetraphenylphosphonium ((3)H-TPP) in non-small cell lung carcinoma in mice.
  
  
  METHODS
  (3)H-TPP accumulation in isolated malignant lung nodules of the Lewis lung carcinoma (LLC) cell line, in LLC-bearing lung, and in control lung was measured at various intervals after inoculation. Tumor uptake and biodistribution of (3)H-TPP were compared with those of (99m)Tc-methoxyisobutylisonitrile (MIBI).
  
  
  RESULTS
  (3)H-TPP accumulation in LLC nodules at 14 d was significantly greater than that in controls, peaked at 21 d, and declined to lower values at 28 d after injection. At 21 d after injection, (3)H-TPP uptake in LLC nodules was greater than that in control lung tissue and in LLC-bearing lung tissue-by 549% and 230%, respectively-whereas (99m)Tc-MIBI nodule uptake was greater by 90% and 30%, respectively.
  
  
  CONCLUSIONS
  The high tumor accumulation and sensitivity to the phase of tumor development suggest the potential use of radiolabeled phosphonium analogs for in vivo tumor staging and as a tool for investigating tumor evolution.
authors.affiliation: Department of Medical Biophysics and Nuclear Medicine, Hadassah University Medical Center, Jerusalem, Israel. imadar@receptor.rad.jhu.edu
authors.forename: Igal
authors.initials: I
authors.lastname: Madar
authors.forename: Lola
authors.initials: L
authors.lastname: Weiss
authors.forename: Gabriel
authors.initials: G
authors.lastname: Izbicki
mesh_terms: D000818:Animals; D018827:Carcinoma, Lewis Lung / Q000000981:diagnostic imaging / Q000378:metabolism; D002289:Carcinoma, Non-Small-Cell Lung / Q000000981:diagnostic imaging* / Q000378:metabolism; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000378:metabolism; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009368:Neoplasm Transplantation; D009861:Onium Compounds / Q000493:pharmacokinetics; D009943:Organophosphorus Compounds / Q000493:pharmacokinetics; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals / Q000493:pharmacokinetics; D017256:Technetium Tc 99m Sestamibi / Q000493:pharmacokinetics; D014018:Tissue Distribution; D014316:Tritium / Q000493:pharmacokinetics; D014407:Tumor Cells, Cultured / Q000378:metabolism
chemical_list: D009861:Onium Compounds; D009943:Organophosphorus Compounds; D019275:Radiopharmaceuticals; D014316:Tritium; D017256:Technetium Tc 99m Sestamibi; C013289:tetraphenylphosphonium