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Classical and follicular variant of papillary thyroid carcinoma: a comparative study on clinicopathologic features and long-term outcome.

Abstract：

INTRODUCTION:The follicular variant of papillary thyroid carcinoma (FVPTC) is the most common histologic subtype of papillary thyroid carcinoma (PTC). However, it is still controversial whether FVPTC should behave differently from classical PTC (CPTC). The present study aimed at evaluating any potential difference in clinicopathologic features and long-term outcome of FVPTC as compared with CPTC. PATIENTS AND METHODS:Of 568 patients with PTC managed from 1973 to 2004, 308 were shown to have CPTC (54.2%) and 67 (11.8%) FVPTC after histologic review. The mean (+/- SD) follow-up period was 11.3 (+/- 8.9) years. The two groups were compared in terms of clinicopathological features, treatment received, and outcome regarding recurrence and disease-specific survival. RESULTS:There was no difference in age and gender ratio between the CPTC and FVPTC patients. Both groups had similar tumor characteristics in terms of tumor size, presence of multifocality, capsular invasion, lymphovascular permeation, and perineural infiltration. However, FVPTC patients had significantly fewer histologically confirmed cervical lymph node metastases (P = 0.027) and extrathyroidal involvement (P = 0.005). The proportion of bilateral resection, adjuvant radioactive iodine, and lymph node dissection did not differ significantly between the two groups. The FVPTC patients had a more favorable tumor risk by DeGroot classification (P = 0.003) and MACIS (Metastasis, Age, Completeness of excision, Invasiveness, and Size) score (P = 0.026). The 10- and 15-year actuarial disease-specific survivals did not differ significantly between FVPTC and CPTC patients (96.2% versus 90.7% and 96.2% versus 89.1%, respectively). CONCLUSIONS:Although patients with FVPTC had more favorable clinicopathologic features and a better tumor risk group profile, their long-term outcome was similar to that of CPTC patients.

journal_name

World J Surg

journal_title

World journal of surgery

authors

Lang BH,Lo CY,Chan WF,Lam AK,Wan KY

doi

10.1007/s00268-005-0356-7

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

752-8

issue

eissn

0364-2313

issn

1432-2323

journal_volume

pub_type

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Classical and follicular variant of papillary thyroid carcinoma: a comparative study on clinicopathologic features and long-term outcome.