Journals / Molecular Imaging and Radionuclide Therapy / 2016 / Cilt: 25 - Sayı: 2

Is Very High Thyroid Stimulating Hormone Level Required in Differentiated Thyroid Cancer for Ablation Success?

Diferansiye Tiroid Kanserlerinde Ablasyon Başarısı için Tiroid Simüle Edici Hormon Seviyesinin Çok Yüksek Olması Gerekli midir?

Pages
79–84
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

High level of thyroid stimulating hormone (TSH) (>=30 mIU/L) is recommended for success of ablation treatment.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: Remnant ablation with radioactive iodine (I-131) is a successful form of treatment that aims to destroy the remaining residual tissue and/or metastatic tissue after total thyroidectomy in differentiated thyroid cancer (DTC) patients.
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Key Findings & Data:High level of thyroid stimulating hormone (TSH) (>=30 mIU/L) is recommended for success of ablation treatment.
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Conclusion & Impact:The success of ablation at lower levels of TSH elevations may be sufficient for patients, and long-term hypothyroidism may not be required.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Objective: Remnant ablation with radioactive iodine (I-131) is a successful form of treatment that aims to destroy the remaining residual tissue and/or metastatic tissue after total thyroidectomy in differentiated thyroid cancer (DTC) patients. High level of thyroid stimulating hormone (TSH) (>=30 mIU/L) is recommended for success of ablation treatment. In this retrospective study, our aim was to investigate whether the TSH levels at the time of ablation effect the success of radioactive iodine remnant ablation. Methods: Patients who were diagnosed with DTC, treated with bilateral total/near total thyroidectomy and who were referred for I-131 remnant ablation were included in this study. Patients with undetectable TSH-stimulated serum thyroglobulin (Tg) level, normal physical examination, negative results on whole body scan with I-131, and no evidence of neck lymph node metastasis on ultrasound were defined as disease-free. The correlation between TSH level at the time of ablation and ablation success was assessed. Results: Two hundred sixty one consecutive patients were included in the present study. Mean TSH level was 19.47±6 mIU/L in the 34 patients with TSH <30 mIU/L, while mean TSH level was 73.65±27 mIU/L in the 227 patients with TSH >=30 mIU/L during I-131 remnant ablation. Ablation was unsuccessful in only one patient with TSH <30 mIU/L who had lung metastasis. Ablation was unsuccessful in 5.1% of patients with TSH >=30 mIU/L. The effect of TSH level was not significant on ablation success (p=0.472). Conclusion: In conclusion, we think that a high TSH serum level alone is not a factor for the success of ablation. Age, presence of metastasis, extent of residual thyroid mass should also be considered. Especially, in the presence of metastatic tissue, obtaining adequate increase in TSH level is not always possible. The success of ablation at lower levels of TSH elevations may be sufficient for patients, and long-term hypothyroidism may not be required.

Özet

Amaç: Diferansiye tiroid kanser (DTK), hastalarında total tiroidektomi sonrası radyoaktif iyot (I-131) ile remnant ablasyon kalan rezidü doku ve/veya metastatik dokunun yok edilmesi amacıyla kullanılan başarılı bir tedavi yöntemidir. Başarılı ablasyon tedavisi için yüksek tiroid simüle edici hormon (TSH) (>=30 mIU/L) seviyesi önerilmektedir. Bu retrospektif çalışmada ablasyon sırasındaki TSH düzeyinin radyoaktif iyot remnant ablasyonun başarısı üzerine etkisinin araştırılması amaçlandı. Yöntem: Bu çalışmaya DTK tanısı olan, bilateral total/totale yakın tiroidektomi ile tedavi edilen ve I-131 ile remnant ablasyon için yönlendirilmiş hastalar dahil edildi. Detekte edilemeyen stimüle-TSH serum tiroglobulin düzeyi, normal fizik muayene, I-131 ile tüm vücut tarama sonuçları negatif ve ultrasonda boyun lenf nodu metastazı bulgusu olmayan hastalar hastalıksız olarak kabul edildi. Ablasyon başarısı ile ablasyon sırasındaki TSH düzeyi arasındaki ilişki değerlendirildi.Bulgular: Mevcut çalışmaya ardışık 261 hasta dahil edildi. I-131 ile remnant ablasyon sırasında TSH düzeyi =30 mIU/L olan 227 hastada ortalama TSH düzeyi 73,65±27 mIU/L idi. TSH =30 mIU/L olan hastaların ise %5,1'inde ablasyon başarısızdı. TSH düzeyinin ablasyon başarısına etkisi anlamlı değildi (p=0,472).Sonuç: Sonuç olarak, biz ablasyon başarısı için yalnızca yüksek serum TSH seviyesinin yeterli bir faktör olmayacağını düşünüyoruz. Yaş, metastaz varlığı, rezidü tiroid dokusunun büyüklüğü de dikkate alınması gereken faktörlerdir. Özellikle metastatik doku varlığında TSH seviyesini yeterli derecede yükseltmek mümkün olmaz. Ablasyon başarısında hastalarda daha düşük düzeyde TSH yükseklikleri yeterli olup, uzun süre hipotiroid dönemde kalınması gerekli olmayabilir.

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Cite This Article

HASBEK, Z., TURGUT, B. (2016). Is Very High Thyroid Stimulating Hormone Level Required in Differentiated Thyroid Cancer for Ablation Success?. Molecular Imaging and Radionuclide Therapy, Cilt: 25 - Sayı: 2, 79–84. https://ajindex.com/articles/295141

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