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Well-differentiated Thyroid Carcinoma: Factors Predicting Recurrence and Survival

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Singapore Med J 2002; 43(9): 457-462
Well-differentiated Thyroid Carcinoma: Factors Predicting Recurrence and Survival

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LHY Lim, KC Soo, YK Chong, F Gao, GS Hong, TH Lim
Correspondence: Soo Khee Chee, admskc@nccs.com.sg

ABSTRACT
Aims
 1) Determine the patient and tumour characteristics for well-differentiated thyroid carcinoma--towards developing a unique risk classification for our largely Chinese population. 2) Assess extent of thyroid surgery required. 3) Document prognostic value of UICC and AMES classification.
Methods Retrospective review of 175 patients treated for primary thyroid epithelial malignancy by the Department of General Surgery at the Singapore General Hospital.
Results There were 78% papillary carcinomas (PC) and 19% follicular carcinomas (FC). Female: male ratio was 3:1. Patient distribution in the UICC stages I, II, III, IV is respectively 56, 11, 31 and 2%. Twenty-six percent had hemithyroidectomy, and 74% total thyroidectomy. Neck dissections were required in 6% of FC compared to 34% of PC. Mean follow-up was 40 months. Extent of surgery did not affect PC/FC survival nor recurrence rates (p=0.53 and 0.06 respectively). Recurrences occurred in 15% FC and 9% PC. Death occurred in one FC and two PC. Survival correlated with UICC stage I/II and stage III/IV groups (p=0.04), and recurrence correlated with AMES High and Low Risk groups (p=0.004). No statistically significant difference was shown for survival between PC and FC or AMES groups and recurrence between PC and FC or UICC groups.
Conclusion Extent of thyroid surgery does not significantly affect local recurrences of PC/FC. The characterisation of thyroid carcinoma here is an important step towards developing a risk classification unique to our largely Chinese population.

Keywords: Thyroid carcinoma, Chinese, risk-group classification, extent surgery
Singapore Med J 2002; 43(9): 457-462

http://smj.org.sg/sites/default/files/4309/4309a3.pdf
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