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Recurrent differentiated thyroid cancer without elevation of serum thyroglobulin
1Department of Clinical Oncology, Thyroid Unit, Royal Marsden Hospital, London, United Kingdom.
Summary
Serum thyroglobulin (Tg) and Tg antibodies (TgAb) are crucial for well-differentiated thyroid cancer (WDTC) monitoring. Some WDTC patients with undetectable Tg/TgAb still have active disease, necessitating additional imaging for accurate recurrence detection.
Area of Science:
- Oncology
- Endocrinology
- Nuclear Medicine
Background:
- Thyroglobulin (Tg) is a key tumor marker for well-differentiated thyroid cancer (WDTC).
- Thyroglobulin antibodies (TgAb) can interfere with Tg measurements.
- Undetectable Tg levels in WDTC patients can be associated with residual or recurrent disease.
Purpose of the Study:
- To investigate the clinical significance of undetectable serum Tg and TgAb in WDTC patients with active disease.
- To determine if specific clinical or histological features predict disease in the absence of detectable Tg.
Main Methods:
- Retrospective analysis of 11 WDTC patients with undetectable Tg and TgAb despite clinical disease.
- Histological review of tumor samples (papillary and follicular carcinomas).
- Immunohistochemical staining for Tg expression in tumor tissues.
Main Results:
- Seven patients had residual disease post-treatment, and 8 relapsed after a disease-free interval.
- Tumor Tg expression was confirmed immunohistochemically in most cases (6/7 papillary, 3/4 follicular).
- No specific clinical or histological features predicted relapse in the absence of detectable serum Tg.
Conclusions:
- Undetectable serum Tg and TgAb do not exclude active WDTC.
- Negative serum Tg was not an adverse prognostic indicator in this cohort.
- Radioiodine scanning and radiological imaging are essential adjuncts to Tg/TgAb monitoring for suspected WDTC recurrence.