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Scientific Articles   |    
Analysis of Prognostic Factors for Patients with Chordoma with Use of the California Cancer Registry
Joe Lee, MD1; Nitin N. Bhatia, MD1; Bang H. Hoang, MD1; Argyrios Ziogas, PhD2; Jason A. Zell, DO, MPH2
1 Department of Orthopaedic Surgery (J.L., N.N.B., and B.H.H.), Spine Center (N.N.B.), Chao Family Comprehensive Cancer Center (B.H.H.), University of California, Irvine, 101 The City Drive South, Pavilion 3, Orange, CA 92868
2 Department of Epidemiology, School of Medicine (A.Z. and J.A.Z.), and the Genetic Epidemiology Research Institute (A.Z.), University of California, Irvine, 224 Irvine Hall, Irvine, CA 92697-7550. E-mail address for J.A. Zell: jzell@uci.edu
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Investigation performed at the University of California, Irvine, Irvine, California

Disclaimer: The ideas and opinions expressed herein are those of the authors, and endorsement by the State of California, Department of Health Services, the National Cancer Institute, the Centers for Disease Control and Prevention, and/or the Genetic Epidemiology Research Institute of the University of California, Irvine is neither intended nor should be inferred.



Disclosure: None of the authors received payments or services, either directly or indirectly (i.e., via his or her institution), from a third party in support of any aspect of this work. One or more of the authors, or his or her institution, has had a financial relationship, in the thirty-six months prior to submission of this work, with an entity in the biomedical arena that could be perceived to influence or have the potential to influence what is written in this work. No author has had any other relationships, or has engaged in any other activities, that could be perceived to influence or have the potential to influence what is written in this work. The complete Disclosures of Potential Conflicts of Interest submitted by authors are always provided with the online version of the article.

Copyright © 2012 by The Journal of Bone and Joint Surgery, Inc.
J Bone Joint Surg Am, 2012 Feb 15;94(4):356-363. doi: 10.2106/JBJS.J.01784
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Abstract

Background: 

Chordoma is the most common primary malignant tumor of the spine. It is extremely rare and has been studied primarily in single-institution case series. Using data from a large, population-based cancer registry, we designed the present study to examine the outcome for patients with chordoma and to determine relevant prognostic factors.

Methods: 

A retrospective analysis of the California Cancer Registry database was performed to identify patients with a diagnosis of chordoma in the years 1989 to 2007. Comparisons examined differences in demographics, disease characteristics, treatment, and survival. Survival analyses were performed with use of the Kaplan-Meier method with log-rank tests and Cox proportional hazards models.

Results: 

Four hundred and nine patients with chordoma were identified; 257 (62.8%) were male and 152 (37.2%) were female. With regard to racial or ethnic distribution, 266 patients (65%) were white; ninety-three (22.7%), Hispanic; forty-three (10.5%), Asian or other; and seven (1.7%), black. The site of presentation was the head in 202 patients (49.4%), spine in 106 patients (25.9%), and pelvis and/or sacrum in 101 patients (24.7%). Hispanic race (p = 0.0002), younger age (less than forty years; p < 0.0001), and female sex (p = 0.009) were associated with cranial presentation, whereas older age (forty years or older; p < 0.0001) was associated with pelvic presentation. After adjustment for clinically relevant factors, a significantly decreased risk of death for chordoma-specific survival was seen for Hispanic race (hazard ratio = 0.51, 95% confidence interval [95% CI], 0.28 to 0.93; p = 0.03), high socioeconomic status (hazard ratio = 0.8, 95% CI, 0.67 to 0.95; p = 0.01), and local excision and/or debulking (hazard ratio = 0.38, 95% CI, 0.18 to 0.81; p = 0.01). Large tumor size was independently associated with an increased risk of death (hazard ratio = 2.05, 95% CI, 1.01 to 4.20; p = 0.048).

Conclusions: 

In this study, the survival of patients with chordoma was significantly better for those who were Hispanic and had a small tumor, high socioeconomic status, and surgical intervention.

Level of Evidence: 

Prognostic Level II. See Instructions for Authors for a complete description of levels of evidence.

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    Accreditation Statement
    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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