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Clinical behavior of follicular variant of papillary thyroid carcinoma: Presentation and survival

✍ Scribed by Harrison W. Lin; Neil Bhattacharyya

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
166 KB
Volume
120
Category
Article
ISSN
0023-852X

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✦ Synopsis

Abstract

Objectives/Hypothesis:

To determine the prevalence and extent of disease characteristics of the follicular variant of papillary thyroid carcinoma (FV‐PTC) and the survival impact of this histopathological diagnosis compared to classical papillary thyroid carcinoma (C‐PTC).

Study Design:

Cross‐sectional population analysis of a national cancer database.

Methods:

Cases of C‐PTC and FV‐PTC were extracted from the Surveillance, Epidemiology and End Results database for 1988 to 2006 and staged. Surgical extent and radioactive iodine (RAI) use were determined. Demographic and staging parameters were statistically compared according to tumor histology. Survival differences according to histology were determined with a Cox proportional hazards model, adjusting for age, sex, T stage, N stage, surgical therapy, and RAI.

Results:

A total of 46,699 patients were identified (68.4% C‐PTC and 31.6% FV‐PTC). Age at presentation and sex distribution were similar between FV‐PTC (47.9 years; 79.3% female) and C‐PTC patients (46.2 years; 77.3% female). Although nodal disease prevalence was significantly lower in FV‐PTC compared to C‐PTC (14.8% vs. 27.8%, respectively; P < .001), T stage was not significantly different (P = .450). Mean overall survivals for patients with FV‐PTC (204.5 months) and C‐PTC (205.3 months) were not significantly different (P = .373). Cox regression analysis revealed that advanced age (P < .001), male sex (P < .001), advanced T stage (P < .001), and positive nodal disease (P < .001) were associated with reduced overall survival, whereas histopathological subtype was not (P = .360).

Conclusions:

Disease presentation (with exception of nodal metastasis) and survival in patients with FV‐PTC are statistically similar to that of C‐PTC, and accordingly these patients carry very similar prognoses. Laryngoscope, 2010

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