Evaluation of synovial angiogenesis in patients with rheumatoid arthritis using ⁶⁸Ga-PRGD2 PET/CT: a prospective proof-of-concept cohort study.

Abstract:

BACKGROUND:The study aimed to evaluate the use of positron emission tomography/computed tomography (PET/CT) with (68)Ga-PRGD2 as the tracer for imaging of synovial angiogenesis in patients with rheumatoid arthritis (RA). METHODS:Twenty untreated active patients with RA underwent (68)Ga-PRGD2 PET/CT and (18)F-FDG PET/CT before treatment; two patients with osteoarthritis served as controls. Among the 20 patients with RA, 12 repeated the evaluations after 3-month treatment. The image findings were correlated with core variables of disease activity, including the clinical disease activity index (cDAI). RESULTS:Our findings demonstrated that (68)Ga-PRGD2 specifically accumulated in the synovia with active inflammation rich in neovasculature with high-level αvβ3-integrin expression, but not in the (18)F-FDG-avid inflammatory lymph nodes. In patients with intense (18)F-FDG uptake in muscles caused by arthritic pain, we observed that (68)Ga-PRGD2 PET/CT was better able to evaluate disease severity than (18)F-FDG PET/CT. Both (68)Ga-PRGD2 accumulation and (18)F-FDG uptake changed in response to therapeutic intervention, whereas the changes of (68)Ga-PRGD2, not (18)F-FDG, significantly correlated with clinical measures of changes in the form of cDAI. CONCLUSIONS:This is the first integrin imaging study conducted in patients with RA that preliminarily indicates the effectiveness of the novel method for evaluating synovial angiogenesis. CLINICAL TRIAL REGISTRATION:This study has been registered online at NIH ClinicalTrial.gov (NCT01940926).

journal_name

Ann Rheum Dis

authors

Zhu Z,Yin Y,Zheng K,Li F,Chen X,Zhang F,Zhang X

doi

10.1136/annrheumdis-2013-204820

subject

Has Abstract

pub_date

2014-06-01 00:00:00

pages

1269-72

issue

6

eissn

0003-4967

issn

1468-2060

pii

annrheumdis-2013-204820

journal_volume

73

pub_type

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