Abstract
Purpose
The authors tried to assess the treatment outcomes depending on the extent of resection in axial chordomas and compare the outcome of two adjunctive therapies (external beam radiation therapy vs. stereotactic radiosurgery) following incomplete tumour resection in terms of local tumour control.
Patients and methods
We retrospectively reviewed 30 consecutive patients with chordoma involving skull base, sacrum and mobile spine between 1993 and 2008. Their initial treatments had different extent of resection. Wide resection was performed for 12 (40%), subtotal resection and adjunctive radiotherapy/radiosurgery for 12 (40%), while six patients (20%) were solely treated with radiotherapy/radiosurgery. For these three groups, overall and progression-free survival rate were compared.
Results
The overall survival rate was 96% at 5 years and 67% at 10 years. Tumour progression-free survival (PFS) rates were 73% and 43% at 5 and 10 years, respectively.
Local tumour progression was seen in 67% in all patients, 58% in wide resection group, 67% in subtotal resection plus radiotherapy/radiosurgery group, and 75% in radiotherapy/radiosurgery group; however, this was not statistically significant (P = 0.69). Neither the extent of resection nor tumour location significantly influenced overall and progression-free survival (P > 0.05). With regard to the type of radiotherapy, tumour progression occurred in all lesions treated with external photon beam radiation therapy (EBRT) but only 38% of lesions treated with stereotactic radiosurgery (SRS) (P = 0.003).
Conclusions
Adjunctive radiotherapy/radiosurgery following subtotal resection showed comparable local control and survival to wide resection. SRS offered superior local tumour control compared to EBRT.
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Acknowledgement
We thank Ahmed Kamal Abul-Magd, MD, for assisting in statistical analyses.
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Comments
Despite the fact that the overall number of patients is not negligible, it encompasses varied locations, degrees of resection and corresponding combinations of adjuvant strategies which breaks the total into numerous fragmentary groups rendering statistical value somewhat questionable.
It is a well-known fact that chordomas may behave quite differently despite undergoing similar treatment protocols. In fact, even after radical resections some tumours have the ability to just keep coming back again from apparently nothing, forming a group of more aggressive behaviour. These tumours may only be distinguished from the pathological standpoint by an elevated cell turnover patented by the Ki-67 or MIB-1, or else by a pattern of higher malignancy (references 1 and 2). No information regarding these particularities is given for the series.
The authors have found no statistical difference between patients treated with different degree of resection, location of tumour or progression of the disease. In fact the only difference acknowledged seems to lie with the time for recurrence between patients treated with EBRT or with GK/CK following surgical resection. However the follow-up for the EBRT group is significantly longer than that for GK/CK (91 versus 62 months). It would be interesting to know the graphic distribution of signalled recurrences along the X-line coordinate for time. If most recurrences, as it likely is, are detected more consistently as the time expands from the date of surgery perhaps the difference found by the authors will likely be attenuated once the follow-up for GK/CK is taken to a mean similar to the one for EBRT.
1. Skull base chordomas: correlation of tumour doubling time with age, mitosis and Ki-67 proliferation index. Holton JL, Steel T, Luxsuwong M, Crockard HA, Revesz T. Neuropathol Appl Neurobiol. 2000 Dec; 26(6):497–503
2. Skull base and Nonskull base chrodomas. Clinicopathologic and immunohistochemical study with special reference to nuclear pleomorphism and proliferative ability. Naka T, Boltze C, Samii A, Herold C, Ostertag H, Iwamoto Y, Oda Y, Tsuneyoshi M, Kuester D, Roessner A. Cancer Nov 1, 2003/Vol 98/Numb 9
Manuel Cunha e Sa
Almada, Portugal
Comments
This is a well-written and well-researched paper regarding the outcome of different management protocols for chordomas, comparing the usual combinations of microsurgery, fractionated radiotherapy and stereotactic radiosurgery, including patients treated with radiosurgery alone.
Chordomas are particularly difficult tumours to manage not only because of their usual late presentation, locally aggressive tendency for recurrence and traditionally acknowledged radio resistance, but also because fewer surgeons and indeed few departments see sufficient numbers to formulate their own policy. Therefore this paper is of particular interest.
The authors have found that wide resection alone or resection with radiotherapy was less effective than radiation treatment alone (although this was not statistically significant). Interestingly the extent of resection was not a relevant factor, underlining the importance of radiation in achieving our aim. Local tumour progression was not prevented by external beam radiotherapy in any patient whereas stereotactic radiosurgery achieved this in 62%. On the face of it, these statements would lead to a chosen policy of using radiosurgery but it has to be acknowledged that many lesions are not suitable for focused radiation by virtue of their large size at presentation. It seems sensible however not to pursue aggressive removal and use microsurgery as an enabling procedure before using radiosurgery. It is also important that in keeping with observations about other benign and low-level malignant pathologies fractionation may not offer an advantage as long as the tumour is geometrically suitable for single fraction treatment.
Andras Kemeny
Sheffield, UK
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Eid, A.S., Chang, UK., Lee, SY. et al. The treatment outcome depending on the extent of resection in skull base and spinal chordomas. Acta Neurochir 153, 509–516 (2011). https://doi.org/10.1007/s00701-010-0928-7
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DOI: https://doi.org/10.1007/s00701-010-0928-7