title: Primary squamous cell carcinomas in the thyroid gland: an individual participant data meta-analysis.
abstract: Primary squamous cell carcinomas arising from the thyroid gland (SCCTh) is extremely rare diseases, which have never been fully studied. Thus, we performed a systematic review and individual participant data meta-analysis of published SCCTh cases, to understand the clinical characteristics and to identify the prognostic factors of primary SCCTh. A literature search was conducted within Medline, EMBASE, Cochrane library databases and KoreaMed using the following Medical Subject Headings (MeSH) keywords: "primary," "squamous," "carcinoma," "cancer," and "thyroid." Eighty-four patients' individual data from 39 articles and five patients' data in our institute were selected for analysis (N = 89). The mean age at diagnosis was 63.0 years (range, 24-90) and female preponderance (M:F = 1:2) was noted. The commonest complaint was the anterior neck mass, followed by dyspnea or dysphagia, and extension to the adjacent structure was found in 72%. The median survival was 9.0 months (95% CI, 6.0-23.0) and 3-year survival rate (3YSR) was 37.6% by Kaplan-Meier method, but only 20.1% by a shared frailty model for adjusting heterogeneity. Complete resection (R0) of tumors was the only significant prognostic factor in multivariable analysis, and the benefit of adjuvant treatment was not proved. The prognosis of patients with SCCTh is very poor (20% in 3YSR), but complete resection of disease is correlated with improved survival. To achieve complete surgical eradication of tumors, early detection and accurate diagnosis should be emphasized.
authors.affiliation: Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
authors.forename: Jae Keun
authors.initials: JK
authors.lastname: Cho
authors.forename: Seung-Hoon
authors.initials: SH
authors.lastname: Woo
authors.forename: Junoh
authors.initials: J
authors.lastname: Park
authors.forename: Min-Ji
authors.initials: MJ
authors.lastname: Kim
authors.forename: Han-Sin
authors.initials: HS
authors.lastname: Jeong
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000401:mortality / Q000628:therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D013964:Thyroid Neoplasms / Q000175:diagnosis* / Q000401:mortality / Q000628:therapy*; D016896:Treatment Outcome; D055815:Young Adult
keywords: Diagnosis; outcomes; squamous cell carcinomas; thyroid gland; treatment