Role of scintigraphy with ⁹⁹mTc-infliximab in predicting the response of intraarticular infliximab treatment in patients with refractory monoarthritis

Eur J Nucl Med Mol Imaging. 2012 Aug;39(8):1339-47. doi: 10.1007/s00259-012-2133-9. Epub 2012 May 16.


Purpose: The rationale for the present study was to evaluate the predictive role of (99m)Tc-infliximab scintigraphy in therapy decision-making in patients with refractory monoarthritis and also candidates for intraarticular (IA) infliximab treatment.

Methods: We studied 12 patients (5 with rheumatoid arthritis and 7 with spondyloarthropathy) with active monoarthritis (11 knees and 1 ankle) that had lasted for at least 3 months. Patients were evaluated clinically and ultrasonographically at baseline and 12 weeks after IA administration of infliximab. At the same time-points, (99m)Tc-infliximab scintigraphy was performed: planar anterior and posterior images of arthritic joints were acquired at 6 and 20 h after injection and target-to-background (T/B) ratios were calculated.

Results: After treatment, a significant improvement in clinical and ultrasonographic parameters was recorded in six patients. Three patients had a partial response and three did not respond. Regarding scintigraphic evaluation, the T/B ratio analysis showed a significantly higher uptake in affected than in nonaffected joints before therapy (1.78 ± 0.46 vs. 1.29 ± 0.27, p = 0.006 at 6 h; 2.05 ± 0.50 vs. 1.41 ± 0.36 at 20 h, p = 0.002), and mean uptake at 20 h was also significantly higher than at 6 h (p = 0.0004). Scintigraphy showed a significant decrease in posttherapy T/B ratios of the affected joints (p = 0.0001 at 6 h and p = 0.0001 at 20 h), indicating a reduction in TNF into the affected joints. Most importantly, responders showed a significantly higher percentage increase in pretherapy uptake from 6 h to 20 h in the affected joints than nonresponders (p = 0.00001).

Conclusion: The results of the present investigation suggest that (99m)Tc-infliximab scintigraphy could be a useful tool to predict the clinical response to IA infliximab treatment in patients with refractory monoarthritis.

MeSH terms

  • Adult
  • Antibodies, Monoclonal*
  • Arthritis / diagnostic imaging*
  • Arthritis / drug therapy
  • Arthritis / therapy*
  • Arthritis, Rheumatoid / diagnostic imaging
  • Arthritis, Rheumatoid / drug therapy
  • Arthritis, Rheumatoid / therapy
  • Decision Making
  • Drug Resistance*
  • Female
  • Humans
  • Infliximab
  • Joints*
  • Male
  • Organotechnetium Compounds*
  • Radionuclide Imaging
  • Treatment Outcome
  • Tumor Necrosis Factor-alpha / antagonists & inhibitors
  • Ultrasonography


  • Antibodies, Monoclonal
  • Organotechnetium Compounds
  • Tumor Necrosis Factor-alpha
  • Infliximab