title: Association of multifocality, tumor number, and total tumor diameter with clinicopathological features in papillary thyroid cancer.
abstract: Tumor multifocality is not an unusual finding in papillary thyroid carcinoma (PTC), but its clinical significance is controversial. In this study, we aimed to evaluate impact of multifocality, tumor number, and total tumor diameter on clinicopathological features of PTC. Medical records of 912 patients who underwent thyroidectomy and diagnosed with PTC were reviewed retrospectively. Patients were grouped into four according to number of tumoral foci: N1 (1 focus), N2 (2 foci), N3 (3 foci), and N4 (≥4 foci). The diameter of the largest tumor was considered the primary tumor diameter (PTD), and total tumor diameter (TTD) was calculated as the sum of the maximal diameter of each lesion in multicentric tumors. Patients were further classified into subgroups according to PTD and TTD. Multifocal PTC was found in 308 (33.8 %) patients. Capsular invasion, extrathyroidal extension, and lymph node metastasis were significantly higher in patients with multifocal tumors compared to patients with unifocal PTC. As the number of tumor increased, extrathyroidal extension and lymph node metastasis also increased (p = 0.034 and p = 0.004, respectively). The risk of lymph node metastasis was 2.287 (OR = 2.287, p = 0.036) times higher in N3 and 3.449 (OR = 3.449, p = 0.001) times higher in N4 compared to N1. Capsular invasion, extrathyroidal extension, and lymph node metastasis were significantly higher in multifocal patients with PTD ≤10 mm and TTD >10 mm than unifocal patients with tumor diameter ≤10 mm (p < 0.001, p < 0.001 and p = 0.001, respectively). There was no significant difference in terms of these parameters in multifocal patients with PTD ≤10 mm and TTD >10 mm and unifocal patients with tumor diameter >10 mm. In this study, increased tumor number was associated with higher rates of capsular invasion, extrathyroidal extension, and lymph node metastasis. In a patient with multifocal papillary microcarcinoma, TTD >10 mm confers a similar risk of aggressive histopathological behavior with unifocal PTC greater than 10 mm.
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey. endoali@hotmail.com.
authors.forename: Abbas Ali
authors.initials: AA
authors.lastname: Tam
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Didem
authors.initials: D
authors.lastname: Özdemir
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Neslihan
authors.initials: N
authors.lastname: Çuhacı
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Hüsniye
authors.initials: H
authors.lastname: Başer
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Cevdet
authors.initials: C
authors.lastname: Aydın
authors.affiliation: Department of Pathology, Ataturk Education and Research Hospital, Ankara, Turkey.
authors.forename: Aylin Kılıç
authors.initials: AK
authors.lastname: Yazgan
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Reyhan
authors.initials: R
authors.lastname: Ersoy
authors.affiliation: Department of Endocrinology and Metabolism, Faculty of Medicine, Yıldırım Beyazıt University, Ataturk Education and Research Hospital, Bilkent, 06800, Ankara, Turkey.
authors.forename: Bekir
authors.initials: B
authors.lastname: Çakır
mesh_terms: D000328:Adult; D002291:Carcinoma, Papillary / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008198:Lymph Nodes / Q000000981:diagnostic imaging / Q000473:pathology; D008207:Lymphatic Metastasis / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D012189:Retrospective Studies; D013964:Thyroid Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology*; D047368:Tumor Burden; D014463:Ultrasonography
keywords: Multifocal papillary thyroid microcarcinoma; Multifocality; Total tumor diameter; Tumor number