title: Clinical characteristics of poorly differentiated thyroid carcinomas compared with those of classical papillary thyroid carcinomas.
abstract: OBJECTIVE
  The aim of this study was to compare the clinical presentation and prognosis of poorly differentiated thyroid carcinoma (PDTC) with those of classical papillary thyroid carcinoma (PTC) to identify the appropriate surgical modalities for use in conjunction with radioactive iodide ((131)I) therapy and external radiotherapy for treating PDTC.
  
  
  METHODS
  Sixty-seven PDTC patients (mean age 50.3 +/- 18.1 years, range 14-82 years) underwent surgery at the Chang Gung Medical Centre (CGMC), Linkou. To compare clinical presentations and treatment outcomes, 134 age- and gender-matched patients with classical PTC were selected randomly from the patient database at CGMC.
  
  
  RESULTS
  Of the 67 PDTC patients, 53 underwent near-total thyroidectomy. Following surgery, 45 were administered (131)I for remnant ablation and treatment of distant metastatic disease. Forty-one of the 67 (61.2%) patients with PDTC and 26/134 (19.4%) with classical PTC failed to achieve disease-free status. Twenty-four of the 67 (34.3%) PDTC patients eventually died of thyroid cancer after a mean follow-up of 5.9 +/- 0.6 years. Age and TNM staging at surgery were significant indicators of PDTC patient survival and mortality.
  
  
  CONCLUSIONS
  As the prognosis for PDTC patients is poorer than that for classical PTC patients, (131)I treatment following surgery is useful. To improve the survival rate, early diagnosis is crucial for PDTC.
authors.affiliation: Division of Endocrinology and Metabolism, Department of Internal Medicine, Chang Gung Memorial Hospital, Chang Gung University, Taiwan, ROC. einjd@adm.cgmh.org.tw
authors.forename: Jen-Der
authors.initials: JD
authors.lastname: Lin
authors.forename: Tzu-Chieh
authors.initials: TC
authors.lastname: Chao
authors.forename: Chuen
authors.initials: C
authors.lastname: Hsueh
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002277:Carcinoma / Q000473:pathology* / Q000532:radiotherapy / Q000601:surgery; D002291:Carcinoma, Papillary / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D003131:Combined Modality Therapy; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007457:Iodine Radioisotopes / Q000627:therapeutic use; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D019275:Radiopharmaceuticals / Q000627:therapeutic use; D013964:Thyroid Neoplasms / Q000473:pathology* / Q000532:radiotherapy / Q000601:surgery; D013965:Thyroidectomy; D016896:Treatment Outcome
chemical_list: D007457:Iodine Radioisotopes; D019275:Radiopharmaceuticals