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Erschienen in:
27.11.2017 | Bone and Soft Tissue Sarcomas
Analysis of the Infiltrative Features of Chordoma: The Relationship Between Micro-Skip Metastasis and Postoperative Outcomes
Erschienen in: Annals of Surgical Oncology | Ausgabe 4/2018
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Background
Chordomas are very rare primary malignant bone tumors that arise commonly from the sacrum (50–60%) and clivus (25–35%). Chordomas have a high rate of recurrence. The authors confirmed a unique histologic infiltration pattern of chordomas that resembles a skip-metastatic lesion in normal tissue around tumor, which they named “micro-skip metastasis.” This study aimed to examine the correlations between the clinicopathologic features of chordomas, including micro-skip metastasis, and the clinical outcomes, including overall survival, local recurrence-free survival, and distant metastasis-free survival.
Methods
The study analyzed histopathologic and clinical data from patients with sacral chordomas who underwent en bloc resection from July 1991 through July 2014. Cases with a minimum follow-up period shorter than 20 months after resection were excluded. Kaplan–Meier survival analyses with log-rank tests were performed for overall survival, metastasis-free survival, and recurrence-free survival.
Results
The study retrospectively reviewed 40 patients. The mean follow-up period was 98.2 months (range 22–297 months). The local recurrence rate was 41.3%. Micro-skip metastases, observed in 17 patients (42.5%), were associated with a significantly increased risk of local recurrence (p = 0.023) but not with overall survival or distant metastasis-free survival. Poorer overall survival was associated with histologic vascular invasion (p = 0.030) and a greater maximum tumor diameter (p = 0.050).
Conclusions
The presence of micro-skip metastasis was associated with a higher rate of local recurrence. The maximum tumor diameter and the presence of histologic vascular invasion were associated with poorer overall survival.