Prognostic significance of pretreatment plasma D-dimer levels in patients with spinal chordoma: a retrospective cohort study
Plasma D-dimer levels, a marker of hypercoagulation, have not only been used as an indicator for cascaded reaction in the coagulation process but are also reported to be an underlying biomarker in several types of cancers. This retrospective cohort study was designed to evaluate the prognostic value of preoperative plasma D-dimer level in patients with spinal chordoma.
We enrolled 224 patients who underwent surgery for spinal chordoma between 2002 and 2015 at Changzheng Orthopedic Oncology Center. Preoperative clinical parameters were recorded and evaluated by univariate and multivariate Cox regression models. The correlation between preoperative plasma D-dimer levels and survival was assessed using the Kaplan–Meier method.
The optimal cutoff value of pretreatment D-dimer was 840 μg/L determined by X-tile. DFS (disease-free survival) was 64.7% and OS (overall survival) was 75% in the cohort. Multivariate Cox regression model identified D-dimer level as an independent prognostic factor of DFS and OS, as well as treatment history, preoperative Karnofsky Performance Scale, preoperative Frankel score, pathology classification and adjuvant radiotherapy (p < 0.05). In addition, D-dimer level may also be an effective supplement for defining tumor Enneking staging (p < 0.05).
Higher pretreatment plasma D-dimer level was associated with a poor prognosis in chordoma and could be used as an independent prognostic factor for the survival of the patients with spinal chordoma. With supplementation of D-dimer level, Enneking stage may be more able to accurate stratify individualized risk and determine clinical management.
KeywordsSpinal chordoma D-dimer Surgery Disease-free survival Overall survival
This study is supported by the National Natural Science Foundation of China (Grant No. 81702659).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflicts of interest.
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