title: Pharmacokinetics of intravenous ATP in cancer patients.
abstract: OBJECTIVE
  To characterise the pharmacokinetics of adenosine 5'-triphosphate (ATP) in patients with lung cancer after i.v. administration of different ATP dosages.
  
  
  METHODS
  Twenty-eight patients received a total of 176 i.v. ATP courses of 30 h. Fifty-two infusions were given as low-dose infusions of 25-40 microg kg(-1) min(-1), 47 as middle-dose infusions of 45-60 microg kg(-1) min(-1) and 77 as high-dose infusions of 65-75 microg kg(-1) min(-1) ATP. Kinetic data of ATP concentrations in erythrocytes were available from 124 ATP courses. Results are expressed as mean +/- SEM.
  
  
  RESULTS
  Most ATP courses in cancer patients were without side effects (64%), and side effects occurring in the remaining courses were mild and transient, resolving within minutes after decreasing the infusion rate. Baseline ATP concentration in erythrocytes was 1,554 +/- 51 micromol l(-1). ATP plateau levels at 24 h were significantly increased by 53 +/- 3, 56 +/- 3 and 69 +/- 2% after low-dose, middle-dose and high-dose ATP infusions, respectively. At the same time, significant increases in plasma uric acid concentrations were observed: 0.06 +/- 0.01, 0.11 +/- 0.01 and 0.16 +/- 0.01 mmol l(-1), respectively. The mean half-time for disappearance of ATP from erythrocytes, measured in five patients, was 5.9 +/- 0.5 h.
  
  
  CONCLUSIONS
  During constant i.v. infusion of ATP in lung cancer patients, ATP is taken up by erythrocytes and reaches dose-dependent plateau levels 50-70% above basal concentrations at approximately 24 h.
authors.affiliation: Department of Internal Medicine, Erasmus University Medical Centre Rotterdam, The Netherlands.
authors.forename: H J
authors.initials: HJ
authors.lastname: Agteresch
authors.forename: P C
authors.initials: PC
authors.lastname: Dagnelie
authors.forename: T
authors.initials: T
authors.lastname: Rietveld
authors.forename: J W
authors.initials: JW
authors.lastname: van den Berg
authors.forename: A H
authors.initials: AH
authors.lastname: Danser
authors.forename: J H
authors.initials: JH
authors.lastname: Wilson
mesh_terms: D000255:Adenosine Triphosphate / Q000008:administration & dosage / Q000493:pharmacokinetics*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000097:blood* / Q000188:drug therapy; D004912:Erythrocytes / Q000378:metabolism*; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D008175:Lung Neoplasms / Q000097:blood* / Q000188:drug therapy; D008297:Male; D008875:Middle Aged
chemical_list: D000255:Adenosine Triphosphate