Paper Information

Journal:   ASIA OCEANIA JOURNAL OF NUCLEAR MEDICINE AND BIOLOGY   2017 , Volume 5 , Number 1; Page(s) 66 To 69.
 
Paper:  CHANGING THERAPEUTIC PARADIGMS: PREDICTING MCRC LESION RESPONSE TO SELECTIVE INTERNAL RADIONUCLIDE THERAPY (SIRT) BASED ON CRITICAL ABSORBED DOSE THRESHOLDS: A CASE STUDY
 
Author(s):  WILLOWSON KATHY P.*, BERNARD ELIZABETH J., MAHER RICHARD, CLARKE STEPHEN J., BAILEY DALE L.
 
* DEPARTMENT OF NUCLEAR MEDICINE, ROYAL NORTH SHORE HOSPITAL, ST LEONARDS 2065, NSW, AUSTRALIA
 
Abstract: 

A 65 year old male with metastatic colorectal cancer (mCRC) in the liver was referred for selective internal radionuclide therapy (SIRT) following a history of extensive systemic chemotherapy.90Y PET imaging was performed immediately after treatment and used to confirm lesion targeting and measure individual lesion absorbed doses. Lesion dosimetry was highly predictive of eventual response in the follow-up FDG PET performed 8 weeks after therapy. The derived radiation dose map was used to plan a second SIRT procedure aiming to protect healthy liver by keeping absorbed dose below the critical dose threshold, whilst targeting the remaining lesions that had received sub-critical dosing. Again, 90Y PET was performed immediately post-treatment and used to derive absorbed dose measures to both lesions and healthy parenchyma. Additional follow-up FDG PET imaging again confirmed the role of the 90Y PET dose map as an early predictor of response, and a tool for safe repeat treatment planning.

 
Keyword(s): DOSIMETRY, LIVER, RESPONSE, SIRT, 90Y