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Abstract

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#ÃÊ·Ï#
The natural history of low-grade astrocytomas is variable. Although many patients
survive for an extended period of time, other patients have a rapidly progressive course
and early death. In order to determine the specific prognostic factors in low-grade
astrocytoma(LGA) patients with uniform contemporary technique, data from 41
consecutive supratentorial LGA patients(¡Ã18 years of age) treated with radiation therapy
following incomplete resection between June 1989 and May 1993 at our hospital were
analyzed. Variable factors were examined for their association with survival : age at the
time of diagnosis, gender, length and type of neurological symptoms, preoperative
neurological status, contrast enhancement pattern on CT, and extent of the lesion as
defined by CT/MRI. The following characteristics were associated with improved patient
survival by univariate analysis(P<0.05) : onset of symptom to treatment >12 months,
and seizure as a presenting symptom at the time of admission. Other factors were not
significant in determining the length of survival. Overall acturial survival at 3 and 5
years was 82% and 70%, respectively. Nine of these 41 patients had tumor
recurrence/progression with a mean time of 20.6 months. Among 9 tumor
recurrences/progressions, second surgery was performed in 5 patients and 3 of these 5
patients had progressed to high-grade lesions(2 glioblastoma multiformes, 1 anaplastic
astrocytoma). Seven patients died from tumor progression/recurrence. Concerning
surgical removal, an attempt should be made, whenever possible, for a gross total
resection. But, when that is not possible, we think that biopsy or partial debulking
without undue risk of significant neurologic compromies followed by radiation therapy ca
serve as an alternative treatment option in supratentorial LGAs.

Å°¿öµå

Low-grade astrocytoma; Prognostic factors; Survival; Surgery; Radiation therapy.;

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