Evaluation of semi-quantitative scoring system for metaiodobenzylguanidine (mIBG) scans in patients with relapsed neuroblastoma.

Published

Journal Article

BACKGROUND: The purpose of this study was to determine the accuracy of two semi-quantitative scoring systems to assess response to (131)I-metaiodobenzylguanidine (mIBG) therapy in recurrent neuroblastoma. PROCEDURES: Diagnostic mIBG scan pairs (n = 57) were collected for patients who underwent (131)I-mIBG therapy for relapsed neuroblastoma. Two scoring systems were designated: Method 1, which divided the body into nine segments to view osteomedullary lesions with an additional tenth segment to assess soft tissue involvement; and Method 2, which divided the body into seven segments without a corresponding compartment for soft tissue involvement. Four nuclear medicine physicians independently assigned extension and intensity scores utilizing both methods, and separately recorded their impression of whether the post-therapy scan had improved, not changed, or worsened. Inter- and intra-observer concordance and correlation with overall response and progression-free survival (PFS) were performed. RESULTS: Method 1 produced the highest inter-observer concordance and was used to calculate the relative extension scores (post-therapy score divided by pre-therapy score), which correlated significantly with overall response. Patients who achieved complete response (CR) or partial response (PR) (n = 21) had lower relative extension scores, compared to those without response (P < 0.001). The readers' overall impression associated highly (P < 0.001) with the relative extension scores though results were less quantitative. Concordance was higher if initial scores were >5. Relative extension score did not predict PFS. CONCLUSION: Semi-quantitative scoring of mIBG scans provides a more reliable method of assessing response in patients with relapsed neuroblastoma than qualitative impression. The reproducibility and high inter-observer concordance makes mIBG score an important component of overall response criteria in patients with recurrent neuroblastoma.

Full Text

Duke Authors

Cited Authors

  • Messina, JA; Cheng, S-C; Franc, BL; Charron, M; Shulkin, B; To, B; Maris, JM; Yanik, G; Hawkins, RA; Matthay, KK

Published Date

  • December 2006

Published In

Volume / Issue

  • 47 / 7

Start / End Page

  • 865 - 874

PubMed ID

  • 16444675

Pubmed Central ID

  • 16444675

Electronic International Standard Serial Number (EISSN)

  • 1545-5017

International Standard Serial Number (ISSN)

  • 1545-5009

Digital Object Identifier (DOI)

  • 10.1002/pbc.20777

Language

  • eng