Risk factors contributing to a poor prognosis of papillary thyroid carcinoma: validity of UICC/AJCC TNM classification and stage grouping.
ABSTRACT In 2002, the UICC/AJCC TNM classification for papillary thyroid carcinoma was revised. In this study, we examined the validity of this classification system by investigating the predictors of disease-free survival (DFS) and cause-specific survival (CSS) in patients.
We examined various clinicopathological features, including the component of the TNM classification, for 1,740 patients who underwent initial and curative surgery for papillary carcinoma between 1987 and 1995.
Clinical and pathological T4a, clinical N1b in the TNM classification, and patient age were recognized as independent predictors of not only DFS, but also CSS of patients. Tumor size, male gender, and central node metastasis independently affected DFS only. There were 1,005 pathological N1b patients, but pathological N1b did not independently affect either DFS or CSS. Regarding the stage grouping, clinical stage IVA including clinical N1b more clearly affected DFS and CSS than pathological stage IVA including pathological N1b.
Clinical stage grouping was more useful than pathological stage grouping for predicting the prognosis of papillary carcinoma patients possibly because pathological stage overestimates the biological characteristics of many pathological N1b tumors.
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ABSTRACT: The 7(th) edition of the American Joint Committee on Cancer (AJCC) has more detailed staging categories for differentiated thyroid cancer (DTC), than the 5(th) edition. The aim was to compare potential alterations in the disease-specific (DSS), event-free (EFS) and overall survival (OS), after reclassification from the 5(th) to the 7(th) edition. Data of 2460 patients with DTC referred to our centre were reclassified from the 5(th) to the 7(th) edition of AJCC. DSS, EFS and OS, were calculated using the Kaplan-Meier method and compared by the log-rank-test. The relative abilities of each edition to predict survival were calculated by the proportion of variance explained (PVE). After reclassification to the 7(th) edition, there was an increase in stage I and IV patients from 58.1% to 65.0% and from 6.2% to 10.1%, respectively, and a corresponding decrease of stage II and III patients from 22.4% to 12.5% and 13.3% to 12.4%, respectively. As to DSS, the 7(th) edition had only a marginally higher PVE value than the 5(th) edition. With respect to EFS, the predictability of the 7(th) edition was even inferior to that of the 5(th) edition. Similarly, with regard to OS, the PVE value was slightly better for the older edition. Furthermore, a comparison only for those patients affected by the reclassification revealed no differences for DSS, EFS or OS between classifications. When comparing the stages of the 7(th) with the 5(th) edition of the AJCC for DTC, there was no significant difference in predicting DSS, EFS and OS. This article is protected by copyright. All rights reserved.Clinical Endocrinology 01/2014; · 3.40 Impact Factor
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ABSTRACT: Lateral lymph node metastasis is an important prognostic factor and is predictive of tumor recurrence and cause-specific survival in patients with papillary thyroid cancer (PTC). However, the factors predicting recurrence and clinical outcomes after therapeutic lateral neck dissection are not well established. The aims of this study were to evaluate the incidence, pattern, and factors predictive of PTC recurrence after therapeutic lateral neck dissection. The records of 126 consecutive patients who underwent total thyroidectomy with therapeutic lateral neck dissection for primary PTC at the National Cancer Center were retrospectively reviewed. The factors predictive of recurrence were determined using both univariate and multivariate analyses considering several clinicopathologic variables. The median follow-up period was 61.2 months, during which 22 patients (17.5 %) experienced recurrence with 1 death (0.8 %) due to disease. Locoregional recurrence and distant metastasis were found in 20 cases (15.9 %) and 2 cases (1.6 %), respectively. Male gender, aggressive histology, number of lymph node metastases, initial level of T4-off Tg per ng/mL, and ATA risk categories (high risk) were independent risk factors for recurrence. Of note, initial T4-off Tg levels greater than 4.2 ng/mL showed highest sensitivity and specificity in predicting recurrence. These results provide useful information regarding the clinical outcomes after therapeutic lateral neck dissection for primary PTC and can be used to identify at-risk patients who need aggressive treatment and intensive surveillance for postoperative recurrence.Annals of Surgical Oncology 02/2014; · 4.12 Impact Factor
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ABSTRACT: In papillary thyroid carcinoma (PTC), macroscopic extrathyroid extension (Ex) and clinical node metastasis (N) are prominent prognostic factors. Ex is divided into two grades in the UICC TNM classification: minimal and massive Ex. Massive Ex significantly affects patients' prognoses, whereas minimal Ex has little prognostic value. N is also divided into two grades in the TNM classification: N1a and N1b, depending on the location of metastasis, with N1b graded higher than N1a. However, massive Ex and/or N-positive PTC includes patients with a wide range of biological characteristics and prognoses, depending on their degrees of Ex and N. Other clinicopathological features such as age, gender, and tumor size also influence the prognosis. In evaluations of the biological characteristics of PTC patients with Ex and/or N, we should consider the degrees and relationships of _Ex and N _ with other clinicopathological features.Endocrine Journal 04/2014; · 2.23 Impact Factor