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Prognostic factors in intramedullary astrocytomas: a literature review

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Abstract

Astrocytomas affect a significant portion of patients with intramedullary tumors. These infiltratively growing tumors are treated by a variety of methods—biopsy and decompressive surgery, maximal safe resection, adjuvant oncological therapy. Also, numerous prognostic factors are reported in the literature. Better understanding of factors that influence prognosis may help in treatment planning with the goal of prolonging survival. We have thus undertaken an extensive literature review in order to define factors affecting prognosis. A total of 38 articles were studied. Only tumor grade was consistently reported as the major factor affecting prognosis. The influence of other clinical factors (age, gender, history length, functional status, tumor location or extent, syrinx or cyst presence) can be speculated upon, but cannot be assessed adequately from the available literature. For both low- and high-grade (HG) astrocytomas, maximal safe tumor resection should be the primary treatment objective but is often not feasible in contrast to other intramedullary and spinal neoplasms. Since the biological nature of spinal cord HG glioma is identical to that of the brain, the same treatment algorithm of maximal safe resection followed by concomitant radio- and chemotherapy would be sensible to implement.

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Abbreviations

IMSCT:

Intramedullary spinal cord tumor

LG:

Low grade

IMG:

Intermediate grade

HG:

High grade

WHO:

World Health Organization

GTR:

Gross total resection

STR:

Subtotal resection

PR:

Partial resection

Bio:

Biopsy

PFS:

Progression-free survival

OS:

Overall survival

CSS:

Cause-specific survival

LC:

Local control

EOR:

Extent of resection

RT:

Radiotherapy

CHT:

Chemotherapy

MRI:

Magnetic resonance imaging

FU:

Follow-up

MM:

Morbidity and mortality

NR:

Not reported

NS:

Not significant

KPS:

Karnofsky Performance Status

HR:

Hazard ratio

aHR:

Adjusted hazard ratio

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Acknowledgments

The authors would like to express their gratitude to the library service of Regional Hospital Liberec, particulary to E. Machonská and J. Klímová, for their help in obtaining full text versions of numerous articles cited in this paper.

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Correspondence to Vladimír Beneš III.

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Concurrently with revision submission (and subsequent acceptance) of this article, the largest series of intramedullary astrocytomas to date appeared on Medline (Minehan KJ, Brown PD, Scheithauer BW, Krauss WE, Wright MP (2009) Prognosis and treatment of spinal cord astrocytoma. Int J Radiat Oncol Biol Phys 73: 727–733). Although the authors are aware of this study, due to this unfortunate timing, this series was not included in the review and readers are kindly asked to turn their attention to it.

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Beneš, V., Barsa, P., Beneš, V. et al. Prognostic factors in intramedullary astrocytomas: a literature review. Eur Spine J 18, 1397–1422 (2009). https://doi.org/10.1007/s00586-009-1076-8

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