Evaluation of gadolinium 2,5-BPA-DO3A, a new macrocyclic hepatobiliary chelate, in normal liver and metastatic disease on high field magnetic resonance imaging.

Abstract

RATIONALE AND OBJECTIVES:

A new hepatobiliary gadolinium chelate, gadolinium (Gd) 2,5-BPA-DO3A, was compared in two animal species with Gd HP-DO3A (gadoteridol), a clinically approved extracellular contrast agent, and Gd Cy2-DOTA, a second hepatobiliary chelate in preclinical development. The ligand in Gd 2,5-BPA-DO3A is macrocyclic in nature, as opposed to the linear structure of Gd DTPA. Gadolinium 2,5-BPA-DO3A was evaluated on magnetic resonance imaging at 1.5 T, examining specifically liver parenchymal enhancement and lesion delineation, the latter in metastatic disease.

METHODS:

Gadolinium 2,5-BPA-DO3A was evaluated in five normal rhesus monkeys and four New Zealand White rabbits with implanted VX-2 liver tumors. These studies were compared with magnetic resonance exams in the same animals using Gd HP-DO3A and Gd Cy2-DOTA. A contrast dose of 0.1 mmol/kg intravenous was employed in each instance, with the sequence of administration (for the three agents) randomized and at least 72 hours between injections. Spin echo breathhold T1-weighted scans were obtained before and at multiple times after contrast administration. Postcontrast scans were acquired from 1 to 60 minutes after injection in the monkeys and from 1 to 240 minutes in the rabbits.

RESULTS:

Enhancement of normal liver parenchyma was markedly superior with Gd 2,5-BPA-DO3A compared with Gd HP-DO3A and Gd Cy2-DOTA in both monkeys and rabbits. At 2 and 60 minutes after contrast administration, the liver signal intensity in the monkey was 452 +/- 56 and 440 +/- 69 with Gd 2,5-BPA-DO3A compared with 295 +/- 34 and 256 +/- 38 with Gd HP-DO3A. The difference between agents was statistically significant at all postcontrast time points in the rhesus monkey. Excretion of contrast into the gall bladder was consistently observed after Gd 2,5-BPA-DO3A injection in both animal species. Maximum lesion conspicuity occurred in the rabbit at 45 minutes after Gd 2,5-BPA-DO3A administration. At 45 minutes postinjection, liver-lesion contrast was 0.60 +/- 0.15 with Gd 2,5-BPA-DO3A, 0.35 +/- 0.11 with Gd Cy2-DOTA, and 0.12 +/- 0.04 with Gd HP-DO3A, with the differences between agents being statistically significant.

CONCLUSIONS:

Gadolinium 2,5-BPA-DO3A is superior to both Gd Cy2-DOTA and Gd HP-DO3A in the degree of enhancement of normal liver parenchyma achieved after intravenous injection. This leads to improved liver lesion delineation with Gd 2,5-BPA-DO3A on delayed postcontrast magnetic resonance scans.

• Authors: V M Runge, J W Wells, N M Williams
• Journal: Investigative radiology (Invest Radiol) Vol. 31 Issue 1 Pg. 11-6 (Jan 1996) ISSN: 0020-9996 [Print] United States
• PMID: 8850360 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Contrast Media
• Heterocyclic Compounds
• Organometallic Compounds
• gadolinium 2,5-BPA-DO3A
• gadolinium Cy(2)DOTA
• gadoteridol
• Gadolinium

Topics

• Animals
• Carcinoma (diagnosis, pathology, secondary)
• Contrast Media (administration & dosage, pharmacokinetics)
• Gadolinium (administration & dosage, pharmacokinetics)
• Gallbladder (metabolism)
• Heterocyclic Compounds (administration & dosage, pharmacokinetics)
• Image Enhancement
• Injections, Intravenous
• Liver (anatomy & histology)
• Liver Neoplasms, Experimental (diagnosis, pathology, secondary)
• Macaca mulatta
• Magnetic Resonance Imaging
• Neoplasm Transplantation
• Organometallic Compounds (administration & dosage, pharmacokinetics)
• Rabbits
• Time Factors