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Clinical Trial
. 2004 Oct;45(10):1683-7.

Radiation dosimetry of 99mTc-labeled C225 in patients with squamous cell carcinoma of the head and neck

Naomi R Schechter  1 , Richard E Wendt 3rd, David J Yang, Ali Azhdarinia, William D Erwin, Anne M Stachowiak, Lyle D Broemeling, E Edmund Kim, James D Cox, Donald A Podoloff, K Kian Ang
Affiliations
  • PMID: 15471833
Free article
Clinical Trial

Radiation dosimetry of 99mTc-labeled C225 in patients with squamous cell carcinoma of the head and neck

Naomi R Schechter et al. J Nucl Med. 2004 Oct.
Free article

Abstract

This study assessed the radiation dosimetry of 99mTc-labeled ethylene dicysteine (EC) C225 (EC-C225), a promising radioligand for functional tumor imaging.

Methods: Whole-body scanning was performed on 6 patients with head and neck squamous cell carcinoma up to 24 h after administration of 99mTc-EC-C225. Alternate patients who had been randomized to receive C225 in a phase III trial received 99mTc-EC-C225 before their 20-mg test dose or after their 400 mg/m2 loading dose of unlabeled C225 (patients 1/3/5 and 2/4/6, respectively). Radiation dosimetry was assessed using the MIRD method.

Results: The critical organ was the kidney, with an average radiation-absorbed dose for all 6 patients of 0.0274 mGy/MBq. The average total-body absorbed dose was 0.0022 mGy/MBq (0.243 cGy/1,110 MBq).

Conclusion: The new radiopharmaceutical 99mTc-EC-C225 appears to have reasonable dosimetric properties for a diagnostic nuclear medicine agent. Correlation of the imaging results with clinical findings is the next step.

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