Abstract:
Background:Repeated radioiodine (131I) treatment (RT) are commonly performed in patients with 131I-avid distant metastatic differentiated thyroid cancer (DM-DTC), but more precise indications remain indeterminate. This prospective study was conducted to explore predictors for biochemical response (BR) to next RT. Methods:Totally thyroidectomized patients with 131I-avid DM-DTC demonstrated by initial post-therapeutic whole body scan (Rx-WBS) were consecutively recruited. Repeated RTs were performed at a fixed dose and a fixed interval, which was terminated once a decline in thyroid stimulating hormone-suppressed thyroglobulin (Tgon) could not be achieved or Rx-WBS was negative. BR was evaluated by change rate of Tgon level (ΔTgon%). Results:After exclusion of 27 ineligible courses, a total of 166 neighboring course pairs from 77 patients were established and utilized. Univariate and multivariate analyses showed that the maximum target/background ratio (T/Bmax) on the whole body scan and ΔTgon% derived from the former RT were independently associated to the latter one. In predicting biochemical remission, the positive predictive value (PPV) and negative predictive value (NPV) of T/Bmax at the cut-off value of 8.1 were 79.1% and 84.0%, respectively; whereas the PPV and NPV of ΔTgon% at the cut-off value of 25.3% were 70.8% and 77.1%, respectively. Notably, the PPV of combined T/Bmax ≥ 8.1 and ΔTgon% ≥ 25.3% increased to 87.7%; while the NPV of T/Bmax ≥ 8.1 or ΔTgon% ≥ 25.3% reached as high as 97.7%. Conclusions:This study revealed that combined use of the latest RT-derived T/Bmax and ΔTgon% may efficiently identify biochemical responders/non-responders to next RT, warranting management optimization of patients with 131I-avid DM-DTC.
journal_name
Front Endocrinol (Lausanne)journal_title
Frontiers in endocrinologyauthors
Sa R,Cheng L,Jin Y,Fu H,Shen Y,Chen Ldoi
10.3389/fendo.2020.587315subject
Has Abstractpub_date
2020-11-16 00:00:00pages
587315issn
1664-2392journal_volume
11pub_type
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