title: Gadobenate dimeglumine-enhanced MRI of the breast: analysis of dose response and comparison with gadopentetate dimeglumine.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the clinical efficacy and dose response relationship of three doses of gadobenate dimeglumine for MRI of the breast and to compare the results with those obtained after a dose of 0.1 mmol/kg of body weight of gadopentetate dimeglumine. SUBJECTS AND METHODS. Gadobenate dimeglumine at 0.05, 0.1, or 0.2 mmol/kg of body weight or gadopentetate dimeglumine at 0.1 mmol/kg of body weight was administered by IV bolus injection to 189 patients with known or suspected breast cancer. Coronal three-dimensional T1-weighted gradient-echo images were acquired before and at 0, 2, 4, 6, and 8 min after the administration of the dose. Images were evaluated for lesion presence, location, size, morphology, enhancement pattern, conspicuity, and type. Lesion signal intensity-time curves were acquired, and lesion matching with on-site final diagnosis was performed. A determination of global lesion detection from unenhanced to contrast-enhanced and combined images was performed, and evaluations were made of the diagnostic accuracy for lesion detection and characterization. A full safety evaluation was conducted.
  
  
  RESULTS
  Significant dose-related increases in global lesion detection were noted for patients who received gadobenate dimeglumine (p < 0.04, all evaluations). The sensitivity for detection was comparable for 0.1 and 0.2 mmol/kg of gadobenate dimeglumine, and specificity was highest with the 0.1 mmol/kg dose. Higher detection scores and higher sensitivity values for lesion characterization were found for 0.1 mmol/kg of gadobenate dimeglumine compared with 0.1 mmol/kg of gadopentetate dimeglumine, although more variable specificity values were obtained. No differences in safety were observed, and no serious adverse events were reported.
  
  
  CONCLUSIONS
  Gadobenate dimeglumine is a capable diagnostic agent for MRI of the breast. Although preliminary, our results suggest that 0.1 mmol/kg of gadobenate dimeglumine may offer advantages over doses of 0.05 and 0.2 mmol/kg of gadobenate dimeglumine and 0.1 mmol/kg of gadopentetate dimeglumine for breast lesion detection and characterization.
authors.affiliation: Department of Radiology, German Cancer Research Center, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.
authors.forename: Michael V
authors.initials: MV
authors.lastname: Knopp
authors.forename: Michael W
authors.initials: MW
authors.lastname: Bourne
authors.forename: Francesco
authors.initials: F
authors.lastname: Sardanelli
authors.forename: Martin N
authors.initials: MN
authors.lastname: Wasser
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Bonomo
authors.forename: Carla
authors.initials: C
authors.lastname: Boetes
authors.forename: Markus
authors.initials: M
authors.lastname: Müller-Schimpfle
authors.forename: Margaret A
authors.initials: MA
authors.lastname: Hall-Craggs
authors.forename: Bernd
authors.initials: B
authors.lastname: Hamm
authors.forename: Antonio
authors.initials: A
authors.lastname: Orlacchio
authors.forename: Carlo
authors.initials: C
authors.lastname: Bartolozzi
authors.forename: Mareike
authors.initials: M
authors.lastname: Kessler
authors.forename: Uwe
authors.initials: U
authors.lastname: Fischer
authors.forename: Günther
authors.initials: G
authors.lastname: Schneider
authors.forename: Matthijs
authors.initials: M
authors.lastname: Oudkerk
authors.forename: William L
authors.initials: WL
authors.lastname: Teh
authors.forename: Hans-Björn
authors.initials: HB
authors.lastname: Gehl
authors.forename: Isabella
authors.initials: I
authors.lastname: Salerio
authors.forename: Gianpaolo
authors.initials: G
authors.lastname: Pirovano
authors.forename: Anna
authors.initials: A
authors.lastname: La Noce
authors.forename: Miles A
authors.initials: MA
authors.lastname: Kirchin
authors.forename: Alberto
authors.initials: A
authors.lastname: Spinazzi
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001943:Breast Neoplasms / Q000473:pathology*; D003287:Contrast Media / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D005260:Female; D019786:Gadolinium DTPA / Q000008:administration & dosage*; D006801:Humans; D007275:Injections, Intravenous; D008279:Magnetic Resonance Imaging; D008536:Meglumine / Q000008:administration & dosage* / Q000031:analogs & derivatives*; D008875:Middle Aged; D009942:Organometallic Compounds / Q000008:administration & dosage*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D013997:Time Factors
chemical_list: D003287:Contrast Media; D009942:Organometallic Compounds; C064572:gadobenic acid; D008536:Meglumine; D019786:Gadolinium DTPA