Comparison between low and high radioactive iodine (131I) reablation dose in patients with papillary thyroid cancer.

Abstract:

AIM:The aim of this study was to assess ablation outcome after a second ablation dose and compare the ablation rate after low and high reablation doses of iodine-131 ((131)I) after failure of the first ablation with 3700 MBq. PATIENTS AND METHODS:The study included 81 patients with papillary thyroid cancer; they failed to achieve complete ablation after a first ablative dose of 3700 MBq. Their first follow-up (131)I whole-body scan carried out 6-9 months after ablation showed small residual functioning tissue in the thyroid bed, with no functioning metastases. This is associated with unsuppressed serum thyroglobulin level (Tg) higher than 2 ng/ml. The patients received a second ablation dose, which was low (1110 MBq) in 37 patients and high in the remaining 44 patients (2960 MBq in 36 patients and 3700 MBq in eight patients). A whole-body scan and Tg level assessment were carried out 6-9 months later. The criteria for complete ablation included absence of residual functioning thyroid tissue and a Tg level lower than 2 ng/ml. RESULTS:The overall successful complete ablation rate after the second reablation dose was 75%. This was achieved in 27 of 37 patients (73%) who received a low reablation dose and in 34 of 44 patients (77%) who received a high reablation dose; no statistically significant difference was found between the two groups (P>0.05). CONCLUSION:In patients with papillary thyroid cancer who failed to achieve complete ablation after the first ablation dose of 3700 MBq, the overall complete ablation rate after both a low and a high second (131)I dose was 75%, with no statistically significant difference in ablation rate between low (1110 MBq) and high (2960 and 3700 MBq) doses (73 and 77%, respectively).

journal_name

Nucl Med Commun

authors

M El-Refaei S,W Yassin S,Salman K,Al Munshy T,Al-Ezzi M,M Al-Sayed Y,Abd Elkareem Husseni M

doi

10.1097/MNM.0000000000000233

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

114-9

issue

2

eissn

0143-3636

issn

1473-5628

journal_volume

36

pub_type

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