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  • Title: [The significance of lymph node status in papillary and follicular thyroid gland carcinoma for the nuclear medicine physician].
    Author: Farahati J, Mörtl M, Reiners C.
    Journal: Zentralbl Chir; 2000; 125(10):830-4. PubMed ID: 11098578.
    Abstract:
    The impact of lymph node metastases on prognosis of differentiated thyroid cancer is discussed controversially. Therefore the data of 596 patients with papillary or follicular thyroid cancer are analysed retrospectively, which have been treated between 1980 and 1995 at the Clinic and Policlinic for Nuclear Medicine of the University of Würzburg. The influence of lymph node metastases on prognosis with respect to survival is analysed with the univariate Kaplan-Meier-method and with the multivariate discriminant analysis. In addition, the influence of the prognostic factor "lymph node involvement" on distant metastases is analysed by a stratified comparison and an univariate test. In papillary thyroid cancer, the 15 year-survival-rate for stage pN1 is significantly lower (p < 0.001) with 88.7% as compared to stage pN0 (99.4%). In patients with follicular thyroid cancer this difference is even more pronounced (64.7% versus 97.2%, p < 0.001). However, the multivariate discriminant analysis shows that the only prognostic factors are tumour stage and distant metastases, and--in papillary thyroid cancer--patient's age. So lymph node metastases are not an independent prognostic factor concerning survival. However, lymph node metastases have a prognostic unfavourable influence with respect to distant metastases especially in papillary thyroid cancer stage pT4 (distant metastases in patients with negative lymph nodes 0% and in patients with positive lymph nodes 35.3% [p < 0.001]).
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