title: Analysis of clinical features and prognosis of malignant triton tumor: A report of two cases and literature review.
abstract: Malignant triton tumor (MTT) is a malignant peripheral nerve sheath tumor with rhabdomyoblastic differentiation. The prognosis of patients is poor, and due to its rarity, large case studies are lacking. The aim of this study is to describe the clinical features and identify potential prognostic factors. Two patients with MTT in the head and neck treated at our department are reported. A literature search revealed another 198 published cases. All of these cases then went through a retrospective analysis. The ratio of male-to-female incidence was 1.5:1, and the median age at diagnosis was 29 years. In 41.7% of cases it occurred in patients with neurofibromatosis type 1. The five-year survival of MTT was found to be just 35%. Cox proportional hazards analysis revealed that complete resection (hazard ratio, 0.396; P=0.032) and metastases (hazard ratio, 3.188; P=0.004) were associated with mortality, indicating that complete resection may lead to a longer life span, and that the existence of metastasis suggested a worse prognosis for patients with MTT.
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Guo
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Xu
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Zhongwu
authors.initials: Z
authors.lastname: Su
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Shuling
authors.initials: S
authors.lastname: Ren
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Tengbo
authors.initials: T
authors.lastname: Deng
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Donghai
authors.initials: D
authors.lastname: Huang
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Tian
authors.affiliation: Department of Otolaryngology and Head-Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China; Otolaryngology Major Disease Research Key Laboratory of Hunan, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China.
authors.forename: Yuanzheng
authors.initials: Y
authors.lastname: Qiu
keywords: malignant triton tumor; prognosis; surgery; survival analyses